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Search this topicUse commas when the clause adds supplementary information about someone or something already identified. Our porch, which faces east, gets morning sun is an example. This differs from a defining clause that identifies which porch. Do not substitute that for which or who in this extra-information construction.
That already represents the object of built, so adding it repeats the same grammatical role. Write the shelf that I built, or the shelf I built. Similarly, avoid repeating a subject after who. Check what the relative pronoun replaces before adding another pronoun to the clause.
Use the zero conditional for a general relationship: if plus present simple, followed by another present-simple clause. If this switch is off, the lamp stays dark describes a rule for that setup. It is different from predicting what will happen on one particular future occasion.
For a standard first conditional, use present simple in the if clause and will plus the base verb in the result: If the parcel arrives today, I will unpack it tonight. This pattern describes a realistic possibility. Other uses of will exist, but this is the basic starting form.
Use if plus a past form with would plus the base verb: If I had a workshop, I would build a bookcase. The past form marks an imagined or unlikely situation, not necessarily past time. Keep the real situation and the imagined result clear as you construct it.
Use if plus past perfect, followed by would have plus a past participle. If I had checked the address, I would have found the building sooner imagines an alternative to what happened. Both the condition and result concern the past, so neither is being presented as a current plan.
Combine if plus past perfect with would plus the base verb: If I had brought the charger, my phone would be usable now. The unreal condition belongs to the past while the imagined result belongs to the present. This time combination is a mixed conditional.
Yes. A mixed conditional can link a general or present situation to a past result: If I knew the neighborhood better, I would have chosen a shorter route yesterday. Use a past form for the unreal condition and would have plus a participle for the imagined past outcome.
Match the auxiliary or modal in the statement, usually reversing positive and negative: You can repair it, can’t you? When a positive simple-tense statement has no auxiliary, use do, does, or did in the tag. Match the subject with the appropriate pronoun as well.
In ordinary standard English, aren’t I is the usual negative question tag after a positive statement with I am. For example, I am next, aren’t I? After a negative statement, the tag is am I. This is a conventional pattern rather than a general rule for all subjects.
A falling tone commonly signals that you expect agreement; a rising tone suggests you are less certain and are checking. Practice the same sentence both ways and listen to the difference. The words can stay identical while intonation changes how strongly you expect the listener to confirm them.
It means moving a verb form back when reporting someone’s words, such as changing I am waiting to she said she was waiting. Present perfect can become past perfect too. Adjust pronouns to match the new speaker’s viewpoint, rather than copying every word of the original sentence unchanged.
No. If the information is still true or relevant, retaining a present form can be appropriate. For example, she said the shop opens at nine can report its current schedule. Choose the tense to preserve the intended meaning; reported speech is not simply a mechanical replacement exercise.
Change them when the original words no longer identify the right time or place. Today may become that day if you report it later; here may become there if you are somewhere else. If the original reference is still accurate, keeping it can be clearer and correct.
Use asked plus if or whether, followed by statement word order: She asked whether I had the receipt. Do not keep the inverted order of the direct question. Adjust tense and pronouns when needed so the report accurately reflects who was asked and when.
Keep the question word but change the following clause to statement order. Where is the entrance? can become he asked where the entrance was. Do not write where was the entrance inside that report. The overall sentence reports a question instead of asking it directly.
Use a request pattern such as asked someone to do something. Could you label these boxes? can become she asked me to label the boxes. This preserves the request’s purpose instead of treating it only as a question about ability. Use offered to when reporting an offer.
No. Mustn’t expresses prohibition; don’t have to means something is optional or unnecessary. You mustn’t open the cabinet forbids opening it. You don’t have to open the cabinet leaves the choice available. This distinction matters because the two instructions lead the listener to very different decisions.
Use had to for a past requirement: Yesterday we had to move the furniture. Must itself does not take a normal past-tense form for this meaning. Keep this separate from must have plus a participle, which usually expresses a conclusion about a past event rather than an obligation.
Could is useful when politely asking permission, such as Could I use this desk? For a straightforward reply granting permission, use can or may: Yes, you can use it. Matching the reply to permission avoids making the response sound like a hypothetical possibility instead.
No. Must can express a strong conclusion from evidence. That must be the delivery van means you think the evidence makes that identification very likely. It does not order the van to do anything. Use the surrounding context to distinguish deduction from a requirement.
Use might, may, or could before a base verb to present a possibility rather than certainty. The missing screw might be under the bench means that location is plausible but unconfirmed. These forms do not establish a fact, so keep the uncertainty when repeating the information.
Use can’t for a strong negative deduction: That can’t be our package; the name is different. You are drawing a conclusion from evidence, rather than describing physical inability. Follow the modal with the base verb and make the reason clear when it helps the listener understand.
Use will be plus the -ing form: At noon tomorrow, I will be painting the fence. The sentence places you in the middle of an activity at that future point. It does not say the painting will already be finished by noon.
Source checks for these answers: September 22, 2026. Product instructions and local requirements can vary.