Are these the verbs in this sentence?

He suffered an injury to his knee, and

this is causing him pain and discomfort.
verb pain
verb discomfort

No. Neither of those are verbs. They're both nouns.

The subject of the first clause is "He." You'll find the first verb by asking, "What did he do?"

The subject of the second clause is "this." What does this do?

The verb would be suffered and causing? or is it just suffered?

Yes, the verbs are "suffered" and "is causing" because both are actions.

Yes, the verbs in this sentence are "causing" and "suffered".

To identify the verbs in a sentence, you can follow these steps:
1. Identify the subject of the sentence (in this case, "He").
2. Look for words that express an action or a state of being. Verbs typically describe actions or indicate the occurrence of an action or state.
3. In this sentence, the word "suffered" indicates an action that happened in the past, and "causing" indicates an action that is currently happening.

Therefore, "suffered" and "causing" are the verbs in this sentence.