Tham khảo tài liệu 'english grammar tests-elementary level's archivegrammar questions1', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | English Grammar Tests-Elementary Level s archive Grammar Questions 1 .Which of these is a noun It is. u thing u think u that u there of these is a passive sentence It is. u He s been there u He s been taken there u He s been going there u He will have been there of these is a preposition It is. u thorough u trough u through u throng of these tenses is Past Perfect Simple It is. u She had laughed u She has been laughing u She laughed u She was laughing of these is an adverb It .