Learn English – Which is grammatically correct in English? Don’t forget to write one, too. or Don’t forget to write one, either

grammarpolarity-itemsword-usage

A. Let's make a birthday cake for her.
B. Good idea. I'll write her a card. Don't forget to write one, too/either.
A. I won't.

Best Answer

too / either indicates that one person or things is (to be) treated the same as one that has already been mentioned. too is used in positive sentences:

I have told Jane. - positive
I have told Mary too. - positive

either is used in negative sentences, but only if the first sentence is also negative:

I haven't told Jane. - negative
Don't tell Mary either! - negative

If you have a positive sentence followed by a negative sentence, you use too, even though the second sentence is negative...

I have told Jane. - positive
Don't tell Mary too! - negative

Adding forget to doesn't really affect the choice of adverb:

I have told Jane. - positive
Don't forget to tell Mary too! - negative

So, in your sentence, the two parts are:

I'll write her a card. - positive
Don't forget to write one, too - negative

too is the correct adverb to use, even though the second sentence is negative, because the first sentence is positive.

Note that, if both sentences are negative, you use either:

I won't forget to write her a card. - negative
Don't forget to write one, either - negative

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