a. Simple Present Tense
S+is/am/are+verb III+by+O
b. Present Continuous Tense
S+is/am/are+being+verb III+by+O
c. Present Perfect Tense
S+has/have+been+verb III+by+O
d. Present Perfect Continuous Tense
S+has/have+been+being+verb III+by+O
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