The letter was wrote yesterday.
False. Correct: "was written" (Passive Voice)
“Ular kelganida, men xat yozayotgan edim.” gapidagi fe'l shakli to'g'rimi?
To'g'ri. (Past Continuous ekvivalenti)
She has been living here since 3 years.
False. Correct: "for 3 years" (Present Perfect Continuous)
“Yangi zamonaviy maktab qurildirdi.” gapida grammatik xato bormi?
Bor. To'g'risi: "qurildi" bo'lishi kerak.
By next year, I will have graduated from university.
True. (Future Perfect)
“Men bu inglizcha kitobni oʻqiy olaman.” gapi inglizcha modal fe'llarga mos keladimi?
Ha, "can" modal fe'li funksiyasini bajaradi.
He is always lose his keys.
False. Correct: "is always losing" (Present Continuous for annoying habits)
“If I had money, I would have bought that book yesterday.” gapida xato bormi?
Bor. O'tgan zamon bo'lgani uchun "If I had had money..." (Past Perfect) bo'lishi kerak.