which, who, or why):
• That might explain why he's looking unhappy.
• Let's consider how we can solve the problem.
• I couldn't decide which train I ought to catch.
Other verbs like this include arrange, calculate, check, choose, debate, determine, discover,
discuss, establish, find out, forget, guess, imagine, know, learn, notice, plan, realise, remember,
say, see, talk about, think (about), understand, wonder.
These verbs can also be followed by a wh-word (except 'why') + to-infinitive:
• I don't understand what to do.
• She calculated how much to pay on the back of an envelope.
But notice that if we change the subject in the wh-clause we can't use a to-infinitive:
• I can't imagine what you like about
(but not I can't imagine what to...)
Some verbs must have an object before the
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