Let's Speak English

Before

Before digunakan untuk sesuatu yang terjadi sebelum waktu tertentu. Contoh:

• We should finish this exercise before 4.00.
• I need to buy a present before James comes.
• Before starting any business, it’s a good idea to write a business plan.

Perhatikan bahwa apabila sebuah preposisi diikuti oleh kata kerja, kata kerja tersebut harus berakhiran -ing. Contoh:

• Where did you live before coming to America? Benar
• Where did you live before to come to America? Tidak benar

After

After digunakan untuk sesuatu yang terjadi setelah waktu tertentu. Contoh:

• I’ll see you after work.
• Camilla won’t be home until after midnight.
• David got promoted after just two years with the company.

As yang menunjukkan waktu

As digunakan apabila dua tindakan singkat terjadi bersamaan. Contoh:

• I dropped my keys as I left my apartment.

As juga digunakan apabila dua tindakan lama terjadi bersamaan. Contoh:

• His health improved as he exercised more.
• As time went by his English got better.

As juga digunakan apabila sebuah tindakan terjadi selama berlangsungnya situasi utama. Contoh:

• I woke up as the sun was rising.
• She arrived as you were leaving.

As sebagai alasan

As sering digunakan untuk menunjukkan sesuatu yang merupakan penyebab sesuatu lainnya, seperti kata “because” . Contoh:

• I’m going to bed early as I have to get up early tomorrow.
• As we’re not busy, let’s meet this afternoon for lunch.

As soon as

As soon as digunakan apabila sesuatu langsung terjadi/dilakukan setelah kejadian lainnya. Contoh:

• I’ll give you a call as soon as I’m finished.
• As soon as they go out let’s eat lunch.
• We’ll send payment as soon as you fax the signed contract.

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Rujukan:
http://www.1-language.com/englishcoursenew/unit49_grammar.htm