这句话中的talk为什么不用过去时?There he heard an astronaut,Bob,talk about

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这句话中的talk为什么不用过去时?There he heard an astronaut,Bob,talk about his journey.

hear sb.do sth.
有一些动词后用作宾语补足语的不定式通常不带to.这种动词有两类：一类是感官动词,如see,hear,watch,feel,notice等.如：
I heard him sing.
另一类是某些使役动词,如let,make,have等.如：
Let him go.
They made the children work 12 hours a day.

这句话中的talk为什么不用过去时?There he heard an astronaut,Bob,talk about Who did he tell about the meeting?为什么不用talk呢? I've heard him talk about you often?这里为什么要用talk原型啊? I can't always understand when people talk to me中talk为什么不用过去 let's talk about the picture.中talk用不用加ing为什么 Let’s talk about the picture.中talk用不用加ing为什么? talk的过去时 Come on out to the patio,We'll talk about it out there.这句话神马 has he ever been heard （talk） about his trip to hongkong. talk about Talk about中的about是介词啊? 这句话对吗 what are you talk about