言明盲派命理初级班02:for weeks we have been trying to catch the bank robber.为什么catch不用过去式呢？

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这个句子的时态不是完成时吗？？？为什么catch不用过去式呢？

请帮忙指导

介词to后跟动词原型，记住了吗？

应为前面有个to。。。

这里是try to do sth.啊

不定式后的to 接动词原形

首先要知道to do 是动词不定式，作try 的宾语， try to do sth 是表示想方设法抓强盗的意思。
例：
The driver failed to see the other car in time.
司机没能及时看见另一辆车。
I happen to know the answer to your question.
我碰巧知道你那道问题的答案。
I like to keep everything tidy. 我喜欢每件东西都保持整洁。
I want to speak to Tom. 我想和汤姆谈话。

for weeks we have been trying to catch the bank robber.为什么catch不用过去式呢？ What can we have for main food? We have no need to be afraid of them. we must try our best. For we belong to ourselves and we have we have no use for promises什么意思啊? we have no use for promises应该怎么翻译啊? 改错(每句一处错):We have milk for breakfast everyday what's we going to have for supper today? so it still took many weeks for a letter to reach the person the letter would be sent to we will be looking for your book 翻译〕