I can tell ( )experience that something is wrong with the machinehe didn't buy a new car 和he didn't bought a new car 那句对 /最好是解释下原因,

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I can tell ( )experience that something is wrong with the machinehe didn't buy a new car 和he didn't bought a new car 那句对 /最好是解释下原因,

I can tell ( )experience that something is wrong with the machinehe didn't buy a new car 和he didn't bought a new car 那句对 /最好是解释下原因,
I can tell ( )experience that something is wrong with the machine
he didn't buy a new car 和he didn't bought a new car 那句对 /最好是解释下原因,

I can tell ( )experience that something is wrong with the machinehe didn't buy a new car 和he didn't bought a new car 那句对 /最好是解释下原因,
我没看懂这是啥意思?后面两个选择是要填到前面的空那里去吗?

he didn't buy a new car
didn't 后面跟动词原形

did(do)后面全部都是跟动词原形do的。。所以这里应该用buy

第一句是对的
did 是助动词,在构成否定句时后面应跟动词原形
bought 是buy 的过去时,所以不符题意

同义句可以说成以上两种吗? doesnt work可以用,bad 不可以。用bad有点相当于中式英语了,这是大忌。 bad改成broken更好些吧 bad不行,