一个句子只能有一个谓语动词，其他动词要变身：to do（不定式）或 doing（动名词）。
◆ 只接 to do 的动词（想要、决定、希望类）
want / would like / decide / hope / plan / agree / learn + to do
· I want to join the music club. · She decided to study harder.
◆ 只接 doing 的动词（喜欢、结束、练习类）
enjoy / finish / practise / mind / keep / give up + doing
· He enjoys playing basketball. · I have finished reading the book.
◆ 两者都可以但意思不同（中考高频）
· stop to do（停下来去做另一件事）vs stop doing（停止正在做的事）
He stopped to rest.（停下来去休息。）
He stopped talking.（停止说话。）
· forget/remember to do（忘记/记得要去做）vs forget/remember doing（忘记/记得做过）
Remember to close the door.（记得要关门——还没做。）
◆ 其他常考结构
· It's + 形容词 + to do：It's important to learn English well.
· 疑问词 + to do：I don't know how to use it.
· be busy doing：She is busy preparing for the exam.