4、中文：我今天下午想和你一起去游泳。
(误)I will like to go swimming with you this afternoon.
(正)I would like to go swimming with you this afternoon.(would like是习惯搭配，后接不定式，表示愿意做某事。)
5、中文：他前天可能说这些吗?
(误)Must he have said so the day before yesterday?(MUST用于推测时表示一定，准是，只用于肯定句。)
(正)Can he have said so the day before yesterday?(CAN用于怀疑，推测时表示可能，用于疑问句和否定句。)