I know that we can say:

1. You're taller than I am.

2. He's not as clever as she is.

3. They have more money than we have.

4. I can't run as fast as he can.


1. You're taller than me.

2. He's not as clever as her.

3. They have more money than us.

4. I can't run as fast as him.

Are the sentences with me, her, us etc. also correct? I would say that the first four sentences above are correct and the next four below rather not.

I would say, looking at the photograph: It's we, rather than It's us.

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The first four are grammatically correct, and the verb would not be necessary. The second four are much more common in everyday speech, but not formal writing, because the pronouns should, technically, be the same as those in the first set.
As for the photograph, you can think of it as a picture 'of us' or 'we are in the photo'.

You need to consider the audience in cases like this (how will you sound?).
The sentences in your second set of 4 sentences are not "formally" or "prescriptively" correct. However, they are extremely common and natural in informal English.
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I asked this question because in my grammar manual it says that you can use this or that, i.e. You're taller than I am or You're taller than me.
And as far as I know "me" or "her" or "him" are personal pronouns and they are always placed after the verbs, e.g. I love her. In the sentence "You're taller than me" the pronoun "me" is placed after the word "than," and it's not a verb.

1. You're taller than me.

2. He's not as clever as her.

3. They have more money than us.

4. I can't run as fast as him.

Very prescriptively speaking, the sentences above are incorrect. Grammatically speaking, the pronouns me/her/us/him should be used as objects. However, in the sentences above, they are not objects.
Here are the formally/prescriptively correct versions:

1a. You're taller than I.

2a. He's not as clever as she.

3a. They have more money than we.

4a. I can't run as fast as he.

However, the formally correct versions above sound "stuffy" and unnatural. To play it safe in formal writing, I'd suggest avoiding all 8 of the sentences above. Instead, you could use these (i.e. the first 4 sentences you wrote in your original post):

1b. You're taller than I am.

2b. He's not as clever as she is.

3b. They have more money than we do.

4b. I can't run as fast as he does.
I believe the versions with the object pronouns would be acceptable in formal writing too. I really see nothing wrong at all with them. But it depends what you mean by formal. I am thinking more of a kind of informal-formal, not a kind of overly formal English (= one where you would avoid any contractions and hardly use any words you hear in everyday English, for example).
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I hope I can take advantage of this post to ask you to go into more detail.

Long ago, I was told in this forum that sentences like "You're taller than me" & "You're taller than I" (omitting "am") shouldn't be used.
Shame on me ... Emotion: smile I use the first one a lot when speaking (because of my mother tongue, I guess) and started to use the second one when I was in the UK, because of a teacher who used it quite often (now I don't use it any more -- if I happen to do that, I tend to pause and add the verb! Emotion: smile ).

The poster pointed out that these structures can be ambiguous and gave me an example similar to:

I love her more than you.

If "her" = Mary and "you" = Ann, this sentence can mean either (1) I love Mary more than Ann does or (2) I love Mary more than (I love) Ann (I guess it usually means no. 2).

Since you wrote that "You're taller than I," although stiff, is grammatically correct, I'd like to ask you whether there are any constraints on this structure.
I mean, can we use it only when the verb is intransitive? or does the problem of ambiguity lie only in the pronoun ("you" is both nominative and accusative, while there is not a similar problem with I/me, he/him etc.)

Many thanks!
Since I cannot edit my above post (editing time expires too quickly!), let me add here that the question was not for Amy only.
Please feel free to answer and/or give your opinion.

Hi Kooyeen

As regards the specific sentences in this post, what you see as being grammatically correct will not be seen as being grammatically correct by everyone in all contexts. That's why I advised avoiding the problem in formal written English. Sentences 1b-4b are sentences that hard-core prescriptivists as well as enthusiastic descriptivists can agree on. Emotion: wink
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