Bài tập thì hiện tại hoàn thành. 1.I....(study) Vietnamese for the last 20 years. 2.We....(know) each other for 5 years. 3.I ...(sleep) for 3 minutes now. 4.How long you... (learn) Japanese?- I ...(learn) it since 2015. 5.She..(buy) that bike for 4 months . 6.I ...(sleep) for long time. 7.We..(live) here since 2018. 8.He already... (read) that blog for 2 months. 9.The bill isn't right.They (make) ....a mistake. 10.Don't you want to see this programme ?- It....(start)