He (be) happier if he (stay) at home
She (pass) the exam if she(study) harder.
They(be) late if they (not/take) a taxi.
I (cal) you if I (not/forget) my phone
We (come) if we (be) invited
She (not/meet) him if she (not/come) to London
We (not/ get) married if we (not/go) to the same university.