After

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Example:-

1. After doing his homework, Ahmad went out.

2. Siew Keng left the house after locking the door.

Example:-

1. After Ahmad has done his homework, he will go out.

2. Siew Keng will leave the house after she has locked the door.

Example:-

1. After Ahmad had done his homework, he went out.

2. Siew Keng left after she had locked the door.