1. I can't stand you grumbling all the time.

2. I can''t stand you who are grumbling all the time.

3. I can't stand you who grumle all the time.
---------------------
Does #1 mean #2 or #3?
Which one is similar to #1, #2 or 33?

In 1, "you" needs to be replaced by "your" -- possessive with a gerund.

http://grammar.ccc.commnet.edu/grammar/gerunds.htm#possessive

2 is OK (correct the apostrophe in "can't") but it's rather awkward. The present progressive verb tense usually ends up being wordy.

3 would be better if you don't use "you" --
I can't stand people who grumble all the time.

1. I can't stand you grumbling all the time.

1-2. I can't stand your grumbling all the time.

2. I can't stand you who are grumbling all the time.

3. I can't stand you who grumble all the time.

To determine which sentence (#2 or #3) is similar to sentence #1, let's break down the differences in each sentence.

1. "I can't stand you grumbling all the time." This sentence is grammatically correct and has the intended meaning of someone being frustrated with another person who frequently complains.

2. "I can't stand you who are grumbling all the time." This sentence includes the relative pronoun "who" and uses the present progressive tense ("are grumbling") to describe the ongoing action. This sentence is grammatically correct, but it is not similar to sentence #1 in terms of structure.

3. "I can't stand you who grumble all the time." This sentence removes the present progressive tense ("grumble" instead of "are grumbling") and makes the verb "grumble" in third-person plural. This sentence is also grammatically correct, but it is not similar to sentence #1 in terms of structure.

Considering the context and intended meaning of sentence #1, it is more similar to sentence #3. However, it is worth noting that sentence #1 is the most straightforward and commonly used construction in English.