one more question about 'do so'

[spoon]

Hello,
I have another question about 'do so'.

(a) John bought a book, and Mary did so too.
(b) * John eats peas, and Mary did so.

1. What is the difference between the sentences?

2. And in (a), is it correct without 'too'?

I think there are something differencet concerned with 'verb' or 'too' in above sentences, but I can't figure it out.

I'm looking forward to your brilliant explanation!

Always regards,
Spoon

[hector51]

hi!

I think the 2 sentences above are all incorrect!!they should be:

(a) John bought a book, and Mary did too.(not "Mary did so too")
(b) John ate(not eats) peas, and so did Mary (not "Mary did so")

my 2 cents

[spoon]

hi!
I think the 2 sentences above are all incorrect!!they should be:
(a) John bought a book, and Mary did too.(not "Mary did so too")
(b) John ate(not eats) peas, and so did Mary (not "Mary did so")
my 2 cents

Thanks hector51.

Actually, I'm not sure of which one is right or not because some English books tell me poor information different from that of you, Casiopea and tdol.

I really appreciate your answer and I almost understand all of it.

But what about this sentence? "John cut the cake, and Mary did so, too."

One of my grammar book says it is right. Please help me once more!



Spoon

[hector51]

But what about this sentence? "John cut the cake, and Mary did so, too."

I think this sentence is ok,but I think people don't use this kind of sentence so frequently!! don't make things complicated,plz

[Tdol]

I agree with Hector- it's OK, but you most would cut the 'so'.

[spoon]

I'm very thankful for your kind responses.

Well, I'm preparing for teacher's exam, so I need some more specific information about those complicated sentences. Some English books say this is o.k., but others say it's not. Thus I'm confused with English grammar on it.

Thanks again for helping me. Now, I think I completedly figure out 'do-profoms'.

Be happy!
Spoon