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Because each tense has different functions and uses depending on different times and purposes.
You/swim
Past simple: You swam.
Past continuous: You was swimming.
Past perfect: You had swum.
Past Perfect continuous: You had been swimming.
Present simple: You swim.
Present continuous: You are swimming.
Present perfect: You have swum.
Present perfect continuous: You have been swimming.
Future simple: You will swim./ You are going to swim.
Future continuous: You will be swimming./ You are going to be swimming.
Future perfect: You will have swum./ You are going to have swum.
Future perfect continuous: You will have been swimming./ You are going to have been swimming.
Future in past simple: You would swim./ You was going to swim.
Future in past continuous: You would be swimming.
Future in past perfect: You would have swum.
Future in past perfect continuous: I dont know that we have this kind of tense 
1. After school times, Lan usually __________tuors ________ (tutor) lower grade students.
2. In order to be healthy, Tom always ______rides____________ (ride) a bike on weekends.
3. Last summer, we _________volunteered_________ (volunteer) to give food to homeless people.
4. The lesson usually ______starts__________ (start) at 8 a.m., but today it is late for 15 minutes.
5. Alex: What are you doing?
Anna: I ______am collecting____________ (collect) paper to exchange for plants.
6. Peter: How many eggs do you need for this cake?
Lia: We _______need___________ (need) a lot. Let’s go and get some more.
7. Sam: _______Did____ you ______swim____________ (swim) yesterday afternoon?
Luke: Yes. It was great.
8. The children ________are running__________ (run) around the garden. They look so happy.
9. My father _______grew___________ (grow) an apple tree there two months ago.
10. Mai __________doesn't have________ (not have) any French book. She thinks she will buy some.
11.After school times, Lan usually ________tutors__________ (tutor) lower grade students.
12.In order to be healthy, Tom always ______rides____________ (ride) a bike on weekends.
13.Sam: ______Did_____ you __________swim________ (swim) yesterday afternoon?
Luke: Yes. It was great.
14The children __________are running________ (run) around the garden. They look so happy
1. After school times, Lan usually _____tutors______ (tutor) lower grade students.
2. In order to be healthy, Tom always _______rides____ (ride) a bike on weekends.
3. Last summer, we ____volunteered_______ (volunteer) to give food to homeless people.
4. The lesson usually ____starts_____ (start) at 8 a.m., but today it is late for 15 minutes.
5. Alex: What are you doing?
Anna: I _______am collecting ____ (collect) paper to exchange for plants.
6. Peter: How many eggs do you need for this cake?
Lia: We _______need____ (need) a lot. Let’s go and get some more.
7. Sam: ______Did_____ you ______swim_____ (swim) yesterday afternoon?
Luke: Yes. It was great.
8. The children ______are running_____ (run) around the garden. They look so happy.
9. My father _______grew____ (grow) an apple tree there two months ago.
10. Mai ______doesn't have_____ (not have) any French book. She thinks she will buy some.
1 present simple passive
(thì hiện tại đơn bị động)
=> are not signed
2 present continuous passive
(thì hiện tại tiếp diễn bị động)
=> are being examined
3 past simple passive
(thì quá khứ đơn bị động)
=> was he finally caught
4 past continuous passive
(thì quá khứ tiếp diễn bị động)
=> wasn't being used
5 present perfect passive
(thì hiện tại hoàn thành bị động)
=> have been identified
6 past perfect passive
(thì quá khứ hoàn thành bị động)
=> had been bought
7 will + passive
(will + bị động)
=> will be returned
8 modal verb + passive
(động từ khiếm khuyết + bị động)
=> might never be discovered.
9 by + agent
(by + tác nhân)
=> by a company
Examples of 9: Fifty-eight of his paintings have been identified by police as forgeries and several more are being examined by experts.
(Ví dụ về 9: Năm mươi tám bức tranh của anh ấy đã được cảnh sát xác định là giả mạo và một số bức tranh khác đang được các chuyên gia kiểm tra.)