$1.$ My client and I slowly walked back to the car.

$2.$ Then we saw a small grocery store.

$3.$ We stopped in the grocery store and bought some sandwiches.

$4.$ Bien often doesn't phone to me.

$5.$ Green always takes a bus.

$6.$ He usually walks to work. But now he is driving to work.

$7.$ Look! The ball is falling down.

$8.$ He usually waters the trees in the morning.

$9.$ She isn't listening to the radio now.

$10.$ The sun rises in the East and sets in the West.

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THÌ HIỆN TẠI ĐƠN (Simple Present Tense)

$(+)$ $S$ $+$ $V_{(s/es)}$ 

$(-)$ $S$ $+$ $don't/doesn't$ $+$ $V_{0}$ 

$(?)$ $Do/Does$ $+$ $S$ $+$ $V_{0}$ $?$

THÌ HIỆN TẠI TIẾP DIỄN (Present Continuous Tense)

$(+)$ $S$ $+$ $am/is/are$ $+$ $V-ing$ 

$(-)$ $S$ $+$ $am/is/are$ $+$ $not$ $+$ $V-ing$ 

$(?)$ $Am/Is/Are$ $+$ $S$ $+$ $V-ing$ $?$

THÌ QUÁ KHỨ ĐƠN (Simple Past Tense)

$(+)$ $S$ $+$ $V2/ed$ 

$(-)$ $S$ $+$ $didn't$ $+$ $V_{0}$ 

$(?)$ $Did$ $+$ $S$ $+$ $V_{0}$  $?$