Nếu bạn không mang đủ tiền mặt, bạn có thể thanh toán bằng thẻ.

Vietnamese often repeats the subject in each clause for clarity, so Nếu bạn không mang đủ tiền mặt, bạn có thể... is completely natural.

English often avoids repeating you, but Vietnamese is more comfortable with it. If the subject is already obvious, one bạn can sometimes be omitted in casual speech, but the full version is standard and clear.

Nếu means if. It introduces the condition: Nếu bạn không mang đủ tiền mặt = If you do not bring/carry enough cash.

Like in English, the if-clause can come first or second. So you could also say:

Bạn có thể thanh toán bằng thẻ nếu bạn không mang đủ tiền mặt.

Both are correct.

Here the structure is:

mang + đủ + tiền mặt

This means carry/bring + enough + cash.

A useful pattern in Vietnamese is verb + đủ + noun, where đủ shows that the amount of the thing is sufficient. So mang đủ tiền mặt means to carry enough cash.

Mang usually means to carry, to bring, or to have with you.

In this sentence, it suggests not having enough cash on you. That is slightly different from simply not having enough money at all. If you said không có đủ tiền mặt, that would focus more on not having enough cash, while không mang đủ tiền mặt emphasizes not bringing/carrying enough cash with you.

Tiền mặt specifically means cash. It refers to physical money, such as bills and coins.

That is different from tiền, which just means money in a general sense. In this sentence, tiền mặt is used because it contrasts naturally with paying by card.

Có thể means can, may, or be able to.

So bạn có thể thanh toán bằng thẻ means you can pay by card. It presents card payment as an available option. Without có thể, the sentence would sound more direct or more like a plain statement about the action.

Bằng often means by, with, or using, especially when talking about a method or means.

So:

thanh toán bằng thẻ = pay by card
literally, something like make payment using a card

This is a very common Vietnamese pattern:

• đi bằng xe buýt = go by bus
• viết bằng bút chì = write with a pencil
• thanh toán bằng thẻ = pay by card

Not necessarily. Thẻ just means card.

In this context, people usually understand it as a payment card, such as a debit or credit card. If you want to be more specific, you can say:

• thẻ tín dụng = credit card
• thẻ ghi nợ = debit card
• thẻ ngân hàng = bank card

So bằng thẻ is a general, natural way to say by card.

Vietnamese verbs do not change form for tense the way English verbs do. There is no special verb ending here for present or future.

The time is understood from context. In this sentence, it sounds like a general present possibility or a future situation: If you do not have enough cash, you can pay by card. Vietnamese often leaves this kind of tense distinction unstated unless it is important.

No. Bạn is a common, fairly neutral way to say you, but Vietnamese pronouns depend a lot on age, relationship, and social situation.

In real life, a cashier or staff member might say anh or chị instead of bạn if speaking politely to an adult customer:

• Nếu anh/chị không mang đủ tiền mặt, anh/chị có thể thanh toán bằng thẻ.

So bạn is correct and easy for learners, but it is not the only possible pronoun.