a) Look at the gaps. Which gap asks for: infinitive without to? past simple? present simple? Which words helped you decide? 1. It's getting too dark to see, so let's ..... the search for today. 2. Government ministers ....... to build three more prisons in the next four years. 3. He had been stealing cash from the till for years, but nobody .... until last week.

Correct forms:

• 1 — infinitive without to: let's call off the search. The word let's helped: after let's we use the infinitive without to.
• 2 — present simple: Government ministers plan to build.... The subject is plural, and the sentence talks about a present plan.
• 3 — past simple: nobody noticed until last week. The words until last week show a finished time in the past.

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