An assignation

[Charlie Bernstein]

Why is a comma needed before "not"?

You can look at it two ways.

1. It's a dependent clause. Do you know what dependent and independent clauses are?

A dependent clause adds information to the core sentence without changing its meaning. It's separated from the core sentence with a comma if it starts or ends the sentence and commas at both ends if it's inside the sentence.

2. It's a compound sentence in which a second "it's" is understood but not stated. The parts of compound sentences are separated with commas.

So it's shorthand for "It's an assignation, it's not an assignment.

 

[Charlie Bernstein]

Is "in fact" really needed?

As Tarheel says, it adds meaning. It depends on what you're asking. If you're wondering whether it's grammatically necessary, no, it's not.

 

[Charlie Bernstein]

Are you saying it is impossible to explain?

You're asking a lot of questions, Kingston! No, of course it's not impossible to explain.

 

[kingston_123]

You're asking a lot of questions, Kingston! No, of course it's not impossible to explain.

I am learning English, I really like this site.

 

[Charlie Bernstein]

I am learning English, I really like this site.

Yes, it's a good one!

English is a hard language. Keep at it!