Some questions about the infinitive form

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roseriver1012

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Joined
Dec 21, 2009
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Student or Learner
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Chinese
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China
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China
1. The first thing you must do is to smile.

Is the sentence right in grammar? Shouldn't it be "The first thing you must do is smile", for the reason that when there

is the word "do" in the subject, the predicative should be the bare infinitive, and vice versa?

2. I have nothing to tell but to remain silent. I have nothing to do but sleep.

The above two sentences go for the same rule I mentioned, do they?

3. To be cycling in a sandstorm is frightening. To cycle in a sandstorm is frightening.

What's the difference between the above two sentences in meaning?

4. To have been caught in a sandstorm was a terrible experience.

Having been caught in a sandstorm was a terrible experience.

Is there a difference between those two sentences in meaning?

Thanks for your help! :-D
 
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