Verbs followed by a to-infinitive or a that-clause

Many verbs can be followed directly by a to-infinitive or a that-clause: agree, arrange, beg (not) care, choose claim contrive, decide demand, determine, expect, hope, intend, learn, plan, prefer pretend, promise, resolve swear, threaten and wish;

I decided to ask for my money back

I decided that I would ask for my money back Most of these verbs point to the future, so they are not normally followed by the perfect form of the infinitive. However, verbs referring to intentions, hopes, etc. can be followed by a perfect infinitive, parallel to the use of the future perfect [> 16.12.3]:

/ hope(d) (etc.) to have finished by 12 Some of these verbs (most commonly agree, arrange, decide) are used in the passive after It to introduce a that-clause [> 12.8n.1]:

It was agreed/arranged/decided that we should meet again later

6.24 Verb + question-word + to-infinitive or a clause

All question-words except why can come before the to-infinitive with 'verbs of asking' [> 15.24.2] and the following: consider, decide, discover, explain, find out, forget, hear, (not) know learn, observe perceive remember, see, understand and wonder I don't know what/which/who(m) to choose I wondered how/when/where to get in touch with them The above verbs can also be followed by a clause introduced by any question word (including why) or that;

I don't know why the accident happened