Modal verbs (such as can, could, shall, should, will, would, may, might, and must) combine with verbs in the bare infinitive to express information about the verb such as possibility or necessity.

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“Having to” usage

I am confused in the usage of "having to" in a sentence, mentioned below. Which one is correct/appropriate? The trouble is having to backup … or The trouble is in having to backup ...
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Inverted conditional sentence using 'can' and 'will'

On this page in Wikipedia!, it states for first conditional sentences: The condition can also be expressed using the modal verb should. This form can be used to make an inverted condition ...