1.to close
用法 ：forget+to do 忘记去做某事
+doing 忘记做过某事
2.plans（第三人单数） to go
planed（过去）
用法：plan+to do
3.to work (我妈妈不得不去工作)work为动词
work（我妈妈需要工作）work为名词
need的用法
1.当「名词」用(可数名词)
ex:There is no need for anxiety.【不必焦虑.】
ex:My needs are few.【我的需要很少.】
2.当「一般动词」用
(1).人 + need + to + 原V(人必须做to + 原V之事)【need to = have to】
ex:He needs to study hard.= He has to study hard.
(2).物 + need + V-ing(物必须被V)【含有被动意思】
ex:The car needs washing.
3.当「助动词」用(同can,主词为第三人称单数时,亦不需加s,且只用於否定句及疑问句中)
(1).Do you need to … = Need you …
(2).We don't need to ….= We needn't ….
(3).He doesn't need to …,does he = He needn't …,need he
ex:Do you need to get up so early = Need you get up so early
ex:They don't need to send the letter after all.= They needn't send the letter after all.