ปัญหา 1เลือกประเภทShe ________ in the library for two hours.is studying has studiedhas been studyingwas studying
ปัญหา 2เลือกประเภทWe ________ to improve our English since last month.have been tryingtriedhave triedare trying
ปัญหา 3เลือกประเภทI ________ the guitar all day.have playedam playinghas been playinghave been playing
ปัญหา 7เลือกประเภทMy sister ________ on the phone for 30 minutes.has talked talkhas been talkingtalking
ปัญหา 9เลือกประเภทThe children ________ outside because it’s raining now.didn’t playhasn’t been playingdon’t playhaven't been playing