Can you tell me the grammatical error on the following sentences eg:subject-verb agrrement, run on sentence, verb form and tense, or sentence fragment. Also These sentences need to be re-written.

1. They is both happy.
2. at 3PM I will be feeding the ducks. At the park..
3. This morning I watch TV before I drove here.
4. A giant monster attacked the warehouse yesterday morning the warehouse makes sneakers.

1. Subject-verb agreement

They are both happy.

2. sentence fragment
At 3PM I will be feeding the ducks at the park.

3. verb tense
This morning I watched TV before I drove here.

4. run-on sentence
A giant monster attacked the warehouse yesterday morning; the warehouse makes sneakers. OR A giant monster attacked the warehouse yesterday morning. The warehouse makes sneakers.

Sra

1. The grammatical error in sentence 1 is subject-verb agreement. The correct sentence could be: "They are both happy."

2. Sentence 2 contains a run-on sentence. It can be corrected by separating it into two sentences: "At 3 PM, I will be feeding the ducks. I will be at the park."

3. Sentence 3 has a verb form and tense error. The correct sentence could be: "This morning, I watched TV before I drove here."

4. The error in sentence 4 is a sentence fragment. It can be re-written as: "Yesterday morning, a giant monster attacked the warehouse where sneakers are made."