Kann ich die grammatikalischen Erklärungen auch in Deutsch finden?

Leaving words out

We often leave out some words (e.g. the subject) in the second of two coordinating clauses if the subject is the same for both parts of the sentence, e.g.

• I was tired and wanted to go home.

However, we cannot do that if the subject is different in the second part of the sentence, e.g.

• We were tired and I wanted to go home.

You also cannot leave out the subject in a subordinate clause, e.g.

• I was tired because I was jogging.

After if, when, while, until, once, unless, though and although, we can drop the subject and the verb, especially in common fixed expressions, e.g.

• He is very intelligent, if somewhat lazy.
• Until recently, they lived in Paris.
• Once at the party, I was introduced to her.