: 1) Yan (just /write) the letter to his cousin.
2)He (buy) these stamps last month​

Yan has just write the letter to his cousin

He bought these stamps last month.

Father: hey tommy, do you remember about our traditional family meeting on saturday? we are going to visit granny at 5 o'clock. tommy: oh actually i have some plans for saturday! father: is it much more important than meeting with grandparents? i don't think so tommy: father: listen, son. i see that your plans very important and exciting but we need to visit granny. it is a tradition so we can't just ignore it. and by the way granny is missing you and looking forward to see you. tommy: yeah i know ,dad, but all my friends are coming to this party and i promised that i will father: oh really? but i suppose that your granny is more respectful person so you'd better not to abandon her. see? tommy: yeah dad. then i will call my friends to tell that i'm not coming. father: yes and don't be offended please. you know how your attending important for granny. tommy: of course