下列情况只能用start to do sth1. , 主语是物,不是人。如:The ice started to melt. 2. start已经用于进行时,如:Mary is starting to do her homework.3. start后面跟的是指心理状态或精神活动的词。如:I started to understand the lesson.4. 用于描述天气变化时。如:It started to get dark before we know it.5.强调动作的实际开始时。如:We started to laugh when she entered the room. 其他情况可以互换。
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