to know, wonder.
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He discovered how to open the safe.
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She found out where to buy fruits cheaply.
“Whether + infinitive” can be used after want to know and wonder.
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He wondered whether to write or phone.
“Whether + infinitive” can be used after know, decide, think, remember only in negative and interogative
sentences.
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He needn’t decide yet whether to study science or arts.
Ask, decide, forget, learn, remember can be followed directly by the infinitive. But the meaning will be different.
Learn how = acquire a skill.
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She learned how to drive.
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She learned to trust nobody.
The infinitives can be used after verb + object. The following verbs are used:
Advise, allow, bribe, command, compel, enable, encourage, entitle, feel (b), forbid, force, hear (b), implore,
induce, instruct, invite, let (b), make (b), oblige, order, permit, persuade, remind, request, see (b), show how,
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