- Simplex sentences house a subject and a verb.
- Compound sentences house for, and, nor, but, or, yet, so.
- Complex sentences house a subordinator such as because, since, after, although, or when or a relative pronoun such as that, who, or which.
1. He fell down because he could not see what was in front of him clearly.
2. He knows the woman (that) his sister is talking to.
3. The woman (that is) standing behind him ...
4. He ran very quickly but she arrived ...