These questions ask you to distinguish a result that holds generally from a result expected on one real future occasion. You may need to complete a verb, identify an error, or recognise several sentences whose forms match their time meaning.
Decide the time meaning before choosing the verbs
Read the whole sentence before naming either conditional. First look for scope signals. Words such as generally, whenever and as a rule point to a repeatable relationship; scientific, mathematical and material properties also describe what happens every time the condition holds. A named day, tonight, tomorrow, this afternoon or another one-off situation points towards a real future possibility. Then build the two clauses separately. The condition uses the present simple in both patterns. Only the result changes: use the present simple for a general relationship and will plus the base form for the future consequence.
| Meaning signal | Form to build |
|---|---|
| A truth, law, routine or result that holds whenever the condition occurs | Present simple in the condition and present simple in the result. |
| One open possibility at a stated future time | Present simple in the condition and will plus the base form in the result. |
| Future time mentioned inside the condition | Keep the condition in the present simple; the future reference does not require will there. |
A useful check is to replace if with whenever. If the meaning stays natural and describes the same dependable relationship, the zero conditional is likely. If the sentence instead concerns what will happen on one particular occasion, keep if and build a first-conditional result.
Where the wrong forms come from
- Will appears in the result of a general truth because the sentence sounds certain. Certainty is not the deciding signal: a repeatable property takes a present-simple result, even when it never fails.
- A present-simple result appears in a one-off future event because the condition itself is present. Treat the clauses separately: the present condition does not turn the promised or expected future consequence into a routine.
- Will moves into the if-clause because that clause refers to the future. Ordinary future conditions still use the present simple; place the future marker in the result clause instead.
- Would is chosen for a dependable fact or an open future possibility. Would introduces a hypothetical result, so it does not fit either a stated general law or the real future situations tested here.
- A past form is selected merely because the event has been described in a narrative. Check the time of the conditional relationship itself: a standing rule or an open future condition is not built with a simple past verb.
Try it
Complete the sentence with the correct form of the verb in brackets: The bridge authority has made a firm commitment: if the engineers approve the repairs, the bridge ___ on Friday. (reopen)
Select all that apply: which sentences correctly use the zero or first conditional?
- If you cover warm bread too soon, the crust becomes soft.
- If the lead actor recovers by six, she will join tonight's rehearsal.
- If the lead actor will recover by six, she will join tonight's rehearsal.
- If our parcel arrives this afternoon, I put it in the storeroom.
Which sentence contains an error in the zero-versus-first conditional contrast?
- If salt dissolves in water, the solution conducts electricity.
- If the forecast temperature will reach 30°C tomorrow, we will move the race indoors.
- If the museum reaches capacity this afternoon, staff will close the doors temporarily.
- If foraging honey bees find a rich food source, they communicate its location to the colony.