英语容易混淆的几种语法

(1)那些动词后用原形动词(infinitive without “to” )?
动词后用原形动词(infinitive without “to”)的有：
behold(12 世纪前用字，现代英文中极少用)，bid, feel, have, hear, let, make,
observe, perceive, see, watch, 另help后，可用to(英式英文)或不用to(美式英文)。
(2) play piano or play the piano？
弹奏或演奏乐噐，在乐噐之前要加定冠词 the.
例如：He plays the organ in the church on Sundays.
She practices playing the violin almost every day.
(3)sometime vs. some time vs. sometimes
1. sometime: (过去的)某一时候；来日，改天
例如：I stayed in Taichung sometime last summer. 去年夏天某个时候，我待过台中。
例如：I’ll go to Taichung to see you sometime next summer. 明年夏天某个时候，我
去台中看你。
2. some time: 一段时间
例如：I stayed in Taichung (for) some time last summer. 去年夏天，我在台中待过一段时间。
3. sometimes: 有时候
例如：Sometimes I go to Taichung for business. 有时候我去台中出差。