XXI: Câu phủ định:
1. you take an umbrella when the sun shines
A. you not take an umbrella when the sun don't shine
B. you don't take an umbrella when the sun shine not
C. you don't take an umbrella when the sun doén't shine
D. you doén't take an umbrella when the sun don't shine
2. My brother can speak english fluently
A. My my nrother doesn't can speak english fluently
B. my brother can't speak english fluently
C. my brother no can speak english fluently
D. My brother doen't can speak english fluently
3. The wind blows this morning
A.the wind doesn't blow this morning
B.the wind doesn't blows this morning
C.the wind don't blow this morning
D.the wind no blow this morning