be, have, ought, used, going 다음의 to는 부정사를 이끈다.
love, like, hate, want, try, hope, mean 다음의 to도 부정사를 이끈다.
A: Did you buy cheese?
B: No, I meant to, but the shop was shut(I meant to buy some).
to가 동명사를 이끄는 경우
look forward to, take to, be accustomed to, be used to 등의 숙어에서 to는 전치사이다.
I am looking forward to my holidays/to next weekend/to it.(전치사 + 명사)
I am looking forward to seeing you. (전치사 + 동명사)
be used to + 동명사
I am used to heat/hard work/bad food/noise/dust/it.
I am used to standing in queues.
I am used to the cold(it doesn't worry me).
He is used to working at night(he doesn't mind it).
cf. I am accustomed to it/the dark.
used to + 동사의 원형
They used to burn coal; now they burn fuel oil only.