For Manhattan guide experts, if any!!

Question

This is excerpt from Manhattan Guides:

The first instance of the verb should usually match the helping verb in tense. If you need to change
tenses, repeat the whole verb in the new tense.
Wrong: I have never seen an aardvark, but last year my father DID.
Right: I have never seen an aardvark, but last year my father saw one

Can anyone help me explain what is it trying to convey?? I do understand by logic and usage of grammar that latter is the right answer but how does it support the text mentioned??

Any help would be appreciated!!
Thanks alot

bb · Answer

It says that if you have several verbs in one sentence, they should all match in terms of their tense.... that's really it.

swarman · Answer

But does not SAW fall under the category of simple past tense as well?? sorry if what i m asking is getting TOO lame

mavelous · Answer

"I have never seen an aardvark, but last year my father DID."

if you want to use a helping verb like did and omit the actual verb (see), the verb you're using must be in the same tense. in the sentence above, first clause is in present perfect, second clause is in simple past. i.e. the clause "but last year my father DID." would only work if it were preceded by something like "I never saw the aardvark when i visited the countryside"

mavelous · Answer

in the second sentence you have different tenses, so you cannot use a helping verb while omitting your main verb - hence the rule about repeating the whole verb if you need to change tenses

swarman · Answer

oohhhh I get it now... Thank you so much mavelous

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