I earn less than he does.
我比他钱挣得少。
主句与从句中的动词不必使用同一时态:
He knows more than I did at his age.
他要比我在他这个年龄时懂得多。
如从句由than/as+I/we/you+动词组成而时态并无变化时,常常将动词省略:
I’m not as old as you(are).
我没有你年龄大。
He has more time than I/we(have).
他的时间比我/我们多。
正规英语中as/than后仍使用I/we,因为动词虽被省略,代词仍被看做是动词的主语,因此仍用主格。但在非正式英语中,me/us更常用:
He had more time than me.
他比我时间多。
They are richer than us.
他们比我们富有。
如than/as后跟he/she/it+动词,常常保留动词:
You are stronger than he is.
你比他强壮。
但在极正式的英语中,可以用he/she/they而免去动词。在非常口语化的英语中可用him/her/them而免去动词。
这些规则也适用于副词比较级:
I swim better than he does/better than him.
我游泳比他好。
They work harder than we do/harder than us.
他们比我们干得卖劲。
You can’t type as fast as I can/as fast as me.
你打字不如我快。