用be able to do be afraid of sth allow sb to do ask to do 用这些短语写一个小短文　几句话就行

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用be able to do be afraid of sth allow sb to do ask to do 用这些短语写一个小短文　几句话就行

如果是陈述过去某次发生的事情,用过去时是完全正确的；如果每天都是花2小时写作业,就是一个频繁发生的事情,还是用现在时比较好,具体要看语境.单是这样一个句子的话,我觉得用过去时是没有错的.
希望回答对你有用哦^^

It___me two hours to do my homework （我花了2个小时写作业）这里的如果是陈述过去某次发生的事情，用过去时是完全正确的；如果每天都是花2小时

I am able to help you，but I am afraid of that your teacher do not allow you to ask anybody to help you。

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