do和BE动词的用法例 when do you intend to buy a new car?;when are you going to buy a new car?为什么第二句不用DO呢

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do和BE动词的用法例 when do you intend to buy a new car?;when are you going to buy a new car?为什么第二句不用DO呢

do和BE动词的用法例 when do you intend to buy a new car?;when are you going to buy a new car?为什么第二句不用DO呢
do和BE动词的用法
例 when do you intend to buy a new car?;
when are you going to buy a new car?
为什么第二句不用DO呢

do和BE动词的用法例 when do you intend to buy a new car?;when are you going to buy a new car?为什么第二句不用DO呢
因为Do后面+实意动词
Be动词,即:am/is/are后面是实意动词+ing形式

因为are后面已经有个实意动词go啦。
一般说来,你可以用改变语序的方法来判断。比如这句:when you are going to buy a new car?
错改成when you do going to buy a new car?显然就不对了。

do是助动词 后面要有动词

第一句中do 是助动词 构成疑问语序
、第二句中 be going to +动词原形 是固定用法 表示将来按计划要求要发生的事情 一般将来时

do 是助动词,后面加动词,或加be+形容词
be 的后面加动词的ing形式