Put the verbs from brackets in their correct form in the given clauses of time and condition:
1.if my sister-in-law (to write) me when she is arriving,i'll prepare a bdroom for her on time.
2.when students (to graduate) from the univrsity,the (to start) to train for their profssions.
3.as soom as i (to become) a mechanic,i (to repair) all my car accessories.
4.i (to go) to her first-night perfomance in case she (to invite) me.