1. What are seashells? 2. Where do mollusks have their skeletons?
3. How do crabs uses hells?
4. What do people create from shells?
5. What do people keep in shells?
6. What do people and animals have inside their bodies?
7. What do shells help protect sea creatures from?​

1 I haven't seen 9 has been 17 you were working 25 I saw
2 You look / You're looking 10 I've been waiting 18 went 26 he went
3 are you going 11 has just started 19 I started / I had started 27 He had been
4 are you meeting 12 is she getting 20 Host 28 he decided / he'd decided
5 I'm going 13 Does she like 21 you haven't had 29 He was really looking forward
6 Do you often go 14 she thinks 22 I've had 30 is he doing 31 I haven’t heard 32 he left7 are you going 15 Are you working 23 have you seen 24 has he been
8 I'm meeting 16. spoke 

Present Simple
1) She has breakfast at 7 o'clock - повеств
2) She doesn't have breakfast at 7 o'clock. - отриц
3) Does she have breakfast at 7 o'clock? - вопрос

1) I go to the beach every week. - повеств
2) I don't go to the beach every week. - отриц
3) Do I go to the beach evert week? - вопрос

Past Simple
1) She had breakfast at 7 o'clock. - повеств
2) She didn't have breakfast at 7 o'clock. - отриц
3) Did she have breakfast at 7 o'clock? - вопрос

1) I went to the beach yesterday. - повеств
2) I didn't go to the beach yesterday. - отриц
3) Did I go to the beach yesterday? - вопрос

Present Continuous
1) She has breakfast now.  - to have - исключение,поэтому в этом предложении вместо Present Continuous употребляется Present Simple. Но может быть у вас не были рассмотрены исключения,поэтому напишу в континиусе, правда скорее всего это будет ошибкой,потом что это - искл.
1) She is having breakfast now. - повеств
2) She isn't having breakfast now. - отриц
3) Is she having breakfast now? - вопрос

1) I'm going to the beach now. - повеств
2) I'm not going to the beach now. - отриц
3) Am I going to the beach now? - вопрос