1/ built ( QKĐ ; dấu hiệu : last week )
2/ haven't losen ( HTTD ; dấu hiueej : so far )
3/ haven't made ( HTHT ; dấu hiệu : yet )
4/ Have - met ( HTHT ; dấu hiệu : ever ) - sat ( QKĐ ; dấu hiệu : Last year)
5/ opens - closes ( HTĐ ; dấu hiệu: usually )