7. They started checking the machines two hours ago -->They have 8. They started building the bridge two years ago --> They have…………………………………………………………………………….. 9. Nam started learning English in 1998 --> Nam has……………………………………………………………………………. 10. Khanh started playing computer games in 2002 --> Khanh has…………………………………………………………………………….. Làm giúp mk nha !!! Mk hứa vote 5 * + câu trl hay nhất cho người nhanh nhất và đúng nhất nha

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7.  They have checked the machines for two hours

8. They have built the bridge for two years

9. Nam has learnt English since 1998 

10. Khanh has played computer games since 2002

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