Below are some ideas for teaching students to write sentences:
1. Model writing simple sentences for students.
2. Give students a list of words and have them create as many simple sentences as possible using those words.
3. Have students circle all of the nouns in a paragraph and then write a simple sentence using one of those nouns.
4. Give students a list of verbs and have them write a simple sentence for each one.
5. Have students identify the subject and predicate in a sentence and then write their own sentence with the same structure.
6. Have students brainstorm a list of simple sentences about a particular topic.
7. Give students a sentence and have them break it down into its component parts (subject, verb, object, etc.) and then write their own sentence using the same parts.
8. Have students read a paragraph and then write a simple sentence about each sentence in the paragraph.
9. Have students choose a topic and then write 10 simple sentences about that topic.
Here are some exercises for teaching students to write sentences:
5 basic structures of simple sentences (PDF)
Elementary subject-verb agreement exercises
Writing topic and support sentences
Writing sentences for parts of speech (PDF)
Writing sentences with adjectives (PDF)
Writing sentences with adverbs (PDF)
Writing sentences with prepositions (PDF)
Sentence skills review w. answers & explanations (PDF)
Convert simple into complex sentences (PDF)