Reply to "Having to punish"

Thank you very much David for your wonderful explanation. 

David, Moderator posted
symphony posted:

 The verb after ‘have to’ is used in base form only, right?

No. As you can see, having to is also used, both as a present participle and as a gerund. Have to also has the past-tense and past-participle form had to (He had to / has had to help out a lot) and the third-person singular present formhas to.

I mean the verb used after have to should be in the base form.

For eg: have to + verb (base form)

             have to + work

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