为什么前面用to learn 而后面用learning呢?It took me two years to learn English.和I spend two years learning English.两句话,为什么前面用to learn 而后面用learning呢?

为什么前面用to learn 而后面用learni... 为什么前面用to learn 而后面用learning呢?It took me two years to learn English.和I spend two years learning English.两句话,为什么前面用to learn 而后面用learning呢? All I have to do is learn English.这句里learn是动词,前面干吗用is I'm sorry not to have taken the advice he gave me.为什么前面是用的have taken 而后面用的GAVE?不理解.还请赐教! i cannot remember if i posted the letter 为什么后面用过去式而前面不用 The poor boy had difficulty walking为什么前面是has而后面用walking 为什么说in the ftont of 是在.前面,而在.后面直接用behind the That's why it's important to learn a second language.在这里second前面为什么用a learn English by listening to the radio.by后面的listen to 为什么用动词ing形式? She doesn't know whether to go or wait.为什么前面用的是to go,后面却用wait而不加to呢?原题是She doesn't know whether ______(go) or wait.go,但是为什么? 求分析此句 The goal is to be exposed to novelty and increasing levels of challenge为什么前面用的to be exposed to而后面用的increasing? 'didn't used to do sth' 为什么前面用了过去式后面还用used? how to learn English中为什么how后面加to I think the best way to learn English is by speaking 为什么用to learn 连接而不用learn或lerning连接强调的是为什么要加to /// （ ）a language requires time and effort in addition to talent.为什么用learning,而不可以用to learn或者learn呢.有点混乱呐 grow up healthy and brightly为什么healthy不用副词形式?如题,为什么后面是brightly而前面不是healthily,为什么可以说to grow up healthy,happy and proud,也就是说为什么都用形容词形式呢? prefer to do sth.rather than doing sth.为什么前面是to do而后面是doing.为什么前后不一致.这个句型的意思,用的场合.各位看看这个网页第九条. When he was in his fifties Marx began to learn English.我想问的是 为什么 WHEN HE 后面跟的是WAS 而不是IS?这个叫什么从句?是不是后面从句用什么时态,前面主句就要用同样的时态?