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A. have been
I have been to singgapore for three times
chúc bạn học giỏi!
My brother and I are sitting(sit) next to you and your sister now.
(-)My brother and I are not sitting next to you and your sister now.
(?)Are my brother and I sitting next to you and your sister now?
Mr.Hung and his sons often fly(often/fly)their kites in the afternoon.
(-)Mr.Hung and his sons often don't fly their kites in the afternoon.
(?)Do Mr.Hung and his sons fly their kites in the afternoon?
The ox usually eats(usually/eat) the grass in the field
(-)The ox usually don't eat the grass in the field.
(?)Do the ox eat the grass in the field?
Simple answer, but not true
I disguise Santa Claus/ Father Christmas.
1 ) times
2 ) years
1.three times a week
2.three times a year