I wonder how an infinitive should be used after a to be
verbs, i.e. does the infinitive used this way have to use 'to' or not. For example:
- All you have to do is sit (or to sit or sitting??) and wait.
- So, what we did in this lecture was create (to create or creating??) a new style for our activity ...
Answer
All you have to do is (to) sit and wait.
So, what we did in this lecture was (to) create a new style for our activity ...
It must be an infinitival verb phrase. Gerund-participial clauses (the -ing kind) are not permitted here.
The bare infinitival (without the to) is usual, but where the subject noun phrase contains do in a relative clause, as it does in both your examples, to can be optionally added.
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