It’s (high/about) time – How do we form it?

1. it’s (high) time + past tense (past subjunctive)

• They’ve been engaged for five years, so it’s (high) time they got married.

2. it’s time + for + subject + infinitive

• It’s time for us to go home.

3. it’s time + infinitive (it refers to the speaker and the listener(s) together, we do not say exactly who)

• We have to leave for the airport. It’s time to call the taxi.
• It’s time to water the garden. (It can be anyone, I can water the garden, my husband, my children…)
• It’s time for you to water the garden. (It is clear that it is you who should do it.)
• It’s time you watered the garden. (It is a bit late.)