change the verb from into past tense a. the competition is held b. my class mate is being buying his clothes

The competition was held ( gak ada sambungannya? )
My class mate was buying his clothes ( Is being Buying : sedang sedang membeli, artinya Being sebenarnya tidak perlu ditambahkan ke kalimat tersebut karena jika menambahkan being akan menghasilkan kalimat yang salah )