Simple Future Tense

Active: Subject + will/shall + first form of the verb + object
Passive: Object of the active sentence + will/shall + be + past participle form of the verb + by + subject of the active sentence

You may have verbally accepted a job offer or an invitation. But writing an acceptance letter is still a smart way of formally accepting an offer and expressing your appreciation.

Past Continuous Tense

Fill in the blanks with suitable prepositions

1.    The clerk is —————– his desk.

a)    On
b)    At
c)    In
d)    With

2.    The postman is standing —————– the door.

Fill in the blanks with suitable prepositions

1.    He has been absent —————— school for several days.

a)    At
b)    From
c)    To
d)    On

Active sentences in the simple past tense have the following structure:
Subject + past tense form of the verb + object
Passive sentences in the simple past tense have the following structure:
Object of the active sentence + was/were + past participle form of the verb + by + subject of the active sentence

Active sentences in the present perfect tense have the following structure:
Subject + has/have + past participle form of the verb + object
Passive sentences in the present perfect tense have the following structure:
Object of the active sentence + has/have + been + past participle form of the verb + by + subject of the active sentence