Определите видовременную форму сказуемоего в действительном залоге. 1)I have lost my textbook. 2) It had been snowing for three days already when I arrived at my native town. 3)It began to rain just after the party had started. 4)Why are you so dirty? What have you been doing? 5)By next September the post-graduate will have been writing his thesis for three years. 6)I'll have read the journal by next Sunday.