1. Remember, school comes first.

2. Remember that school comes first.
3. Remember school comes first.

(Which expressions are correct? Are all correct? Do we have to put a comma after 'Remember'?)

number 2

depending on how it is said if ur mom for example says: remember, school comes first so no parties ??

so i'm really not sure english is such a difficult lauguge

John, 1 and 2 are correct.

Yes, there needs to be a comma after "remember" in that context. What you are actually saying is

(You) remember, school comes first.

P.S. To amplify a bit GuruBlue's answer: After the direct address (you are speaking to someone with the "command" to remember), there is a comma.

Sra

All three expressions are correct grammatically, but the meaning may vary slightly depending on the intended emphasis. Whether or not to include a comma after "Remember" depends on the usage and style preferences. Let's go through each option:

1. "Remember, school comes first."
In this expression, a comma is used after "Remember." This form suggests that the speaker is reminding someone to prioritize school over other things. The pause created by the comma emphasizes the importance of school.

2. "Remember that school comes first."
Here, the use of "that" in between "Remember" and "school comes first" makes the expression more straightforward and less conversational. It implies a general piece of advice or a rule to keep in mind.

3. "Remember school comes first."
In this case, there is no comma or conjunction between "Remember" and "school comes first." The expression sounds more direct and concise, almost like a command or a simple statement. It emphasizes the message without any additional words or pauses.

In conclusion, all three expressions are grammatically correct. The decision to include a comma or use the conjunction "that" depends on the desired emphasis and the style of the sentence.