Dễ mà bạn.
Simple Present:
S + V + O => S + be + P2 + by + O
Present Continuous
S + am/is/are + V-ing + O => S + am/is/are + being + P2 + by + O
Present Perfect
S + has/have + P2 + O => S + has/have + been + P2 + by + O
Simple Past
S + V-ed + O => S + was/were + P2 + by + O
Past Continuous
S + was/were + V-ing + O => S + was/were + being + P2 + by + O
Past Perfect
S + had + P2 + O => S + had + been + P2 + by + O
Simple Future
S + will/shall + V + O => S + will + be + P2 + by + O
Future Perfect
S + will/shall + have + P2 + O => S + will + have + been + P2 + by + O
Be + going to
S + am/is/are + going to + V + O => S+ am/is/are + going to + be + P2 + by + O
Model Verbs dùng như simple future bạn thay will bởi model verbs nhé
Nếu S là đại từ nhân xưng hay someboby,something,.... thì ko cần dùng by.
Ngoài ra còn kiểu đặc biệt và biến thể nuk có gì bạn tra nhé nhiều cực nhưng kinda là vậy thôi.
Good Luck !