20. The police are still questioning witnesses and garthering informations=>information
21. Please give him this letter when he will come=>comes back this afternoon.
22. Vegetables must keep=>be kept in a refrigerator to keep them fresh.
23. Jack is always forget=>forgetting his pen and that really annoys me.
20. The police are still questioning witnesses and garthering informations
=> information
21. Please give him this letter when he will come back this afternoon.
=> was coming
22. Vegetables must keep in a refrigerator to keep them fresh.
=> be kept
23. Jack is always forget his pen and that really annoys me.
=> forgetting