2underline the correct form of the present perfect in italics. it may be possible to use both forms. 1 i’ve sent / been sending the invoice three times but they still haven’t paid. 2 it’s a successful business; they’ve opened / been opening eighty branches in the last three years. 3 how long have you worked / been working here? 4 i’ve tried / been trying to get through all day but the number is always engaged. 5 how much holiday have you taken / been taken this year?