He suffered an injury to his knee, and this is causing him pain and discomfort.
Help find the verbs
The verbs tell you the ACTIONS in the sentence. Which words tell you the two separate actions going on in this sentence, one before the comma and one after?
http://chompchomp.com/terms/verb.htm
To find the verbs in a sentence, you need to identify the action words that express what someone or something is doing. In the given sentence, there are two verbs:
1. suffered - This is the main verb in the sentence and indicates the action of experiencing or enduring something, in this case, an injury.
2. causing - This is a participle verb form and functions as a present participle. It shows that the injury is responsible for the pain and discomfort being experienced by the person.
To summarize, the verbs in the sentence are "suffered" and "causing."