1 tấm bê tông có khối lượng 2 tạ bị rơi xuống bờ mương . Trên bờ có 4 bạn hs , lực kéo của mỗi bạn là 490N . Hỏi 4 bạn hs có kéo dc tấm bê tông lên dc ko ? vì sao?

Các câu hỏi liên quan

THE PAST CONTINUOUS/ PROGRESSIVE TENSE (Thì quá khứ tiếp diễn) I was cooking dinner at 7p.m. yesterday (hành động đang diễn ra tại 1 thời điểm cụ thể trong quá khứ) (at + giờ/ this time/ that time + adv quá khứ (yesterday/…ago/ last…) I cooked dinner yesterday. When I was cooking dinner, he came. (hđ đang diễn ra thì có 1 hđ khác chen ngang) While she was listening to music, he was playing the guitar. (2 hđ xra đồng thời trong quá khứ) + S + was/ were + Ving At + giờ/ this time/ that time + yesterday/ last…/ ….. ago When QKĐ, QKTD When QKTD, QKĐ While QKTD, QKĐ While QKDT, QKTD - S + was/ were + not + Ving ? Was/ Were + S + Ving..? Yes, S + was/ were No, S + was/ were + not Bài tập A. Complete the sentences. Use the past simple of the verbs in brackets. 1) My sister ____was going _____ (go) to the cinema yesterday. 2) He _____wasn’t like_____ (not like) football, so he ___was playing_____ (play) voleyball. 3) He ___was breaking ____ (break) the window when he ___was____ (be) 5. 4) My mum ___was___ (be) very angry because we __were coming_____ (come) home very late. 5) She ____was told__ (told) me the problem with her mum and I __were help_____ (help) her. 6) They _____weren’t visiting___ (not visit) the museum of the town, they ________ (preffer) going to the funfair. 7) _____ they ______ (visit) their grandparents yesterday? 8) Who ____ you _____ (be) with when the accident happen? B. Complete the sentences. Use the past continuous form of the verbs in brackets. 1) I ______were studying _______ (study) Science for my test. 2) He ________wasn’t doing_______ (not do) his homework. 3) They _______weren’t playing_______ (not play) rugby because they think is boring. 4) _____ they _______ (listen) to music when you opened the door? 5) She ______was going ______ (go) to the cinema, but her friends didn’t come. 6) That boy ______was playing_____ (play) the violin very well. Maybe, he ____was having________ (have) musical classes. 7) Jane, David and Polly ______were watching __________ (watch) TV when the light turned off. 8) I ______were beginning _________ (begin) my English project when my sister fall. A. Complete the text. Use past simple and continuous. It _was____ (be) a rainy day of November.