- Positive/Affirmative: subject + aux. verb + past participle
- Negative: subject + aux. verb + past participle
- Question: verb + subject + past participle
Auxiliary verb = have/has.
The past participle often ends in “ed” (finished/decided/worked/talked), but many important verbs are irregular and does not end in “ed”
Examples: (lost/done/written/driven/thought etc.).
- Where is your key? I don’t know. I have lost it. (Means: I don’t have it now)
- He told me his name, but I have forgotten it. (Means: I can’t remember it now)
- Is sally here? No, she has gone out. (Means: She is out now)
- I can’t find my backpack. Have you seen it? (Means: Do you know where it is now?)