Tôi nâng xe đạp rồi đạp xe.

Here rồi links two actions and means something like and then, after that, or once that is done.

So the structure is:

• Tôi nâng xe đạp = I lift the bicycle
• rồi
• đạp xe = ride/pedal the bicycle

It shows sequence: first one action happens, then the next one happens.

This is a very common thing in Vietnamese.

• xe đạp is the noun bicycle
• đạp xe is a verb phrase meaning to ride a bicycle or to cycle

So even though đạp can literally mean pedal, the expression đạp xe functions as a normal way to say ride a bike.

That means the sentence is not repeating the exact same structure twice. It is using:

• nâng xe đạp = lift the bicycle
• đạp xe = ride the bike / cycle

Literally, yes, the parts are:

• đạp = pedal, step on
• xe = vehicle

But as a whole, đạp xe is an established expression that means ride a bicycle or go cycling.

Native English speakers often want to translate each word separately, but with Vietnamese it is often better to learn common combinations as full expressions. Here, đạp xe should usually be understood as one unit.

It does not need to be repeated.

In English, you might expect something like I lift the bicycle and then ride the bicycle. Vietnamese often avoids repeating information when the meaning is already clear.

Also, once you say đạp xe, that expression already means ride a bike, so Vietnamese does not need to say đạp xe đạp here.

So the second clause sounds natural without repeating the full noun.

It is grammatically fine, but it may sound a little context-specific.

Why? Because nâng xe đạp means lift the bicycle, as in physically picking it up or raising it. That is possible, but it is not the most common action before riding a bike.

So the sentence is natural if the situation really is:

• you lift the bike up
• then you ride it

If you meant something more like I pick up / get on my bike and ride, Vietnamese would often use different verbs depending on the exact situation.

Nâng means lift, raise, or pick up upward.

It usually suggests moving something upward with your hands or physically raising it. In this sentence, nâng xe đạp means you are lifting the bicycle.

That is different from some other possible bicycle actions, such as:

• moving it along by hand
• parking it
• getting on it
• riding it

So nâng is specifically about the lifting action.

Vietnamese often does not mark tense the way English does.

Tôi nâng xe đạp rồi đạp xe can be understood from context as:

• I lift the bike and then ride it
• I lifted the bike and then rode it
• I will lift the bike and then ride it

The time is usually understood from context, or from other words in the conversation, such as:

• hôm qua = yesterday
• bây giờ = now
• ngày mai = tomorrow
• đã = past marker
• sẽ = future marker

Without those, the sentence is just a neutral description of the action sequence.

Sometimes, yes.

Vietnamese often drops pronouns when the subject is obvious from context. So in conversation, you might hear just:

• Nâng xe đạp rồi đạp xe.

But if you are giving a full sentence on its own, especially for learners, keeping tôi is completely normal and clearer.

The tones matter a lot:

• nâng — level tone on â with ng at the end
• đạp — heavy/falling nặng tone
• rồi — falling-rising huyền tone

A few helpful notes:

• đ is not the same as English d; it is closer to a hard d sound
• ng at the end is like the sound at the end of English sing
• â is a short central vowel, not like English a in cat

If your tones are wrong, listeners may still guess from context, but getting the tone on đạp especially will help a lot.

It is possible grammatically, but it is not the most natural way to say it.

Why?

• chiếc xe đạp is fine: chiếc is a classifier often used for vehicles
• đạp nó sounds odd if you mean ride it, because đạp by itself usually means pedal, step on, or even kick depending on context

For ride a bicycle, Vietnamese strongly prefers đạp xe.

So:

• Tôi nâng chiếc xe đạp rồi đạp xe = natural
• Tôi nâng chiếc xe đạp rồi đạp nó = understandable in some contexts, but not the usual way to say then ride it

Yes, depending on style.

Some alternatives are:

• sau đó = after that
• rồi sau đó = and then after that
• sometimes just a pause or comma in casual speech

Examples:

• Tôi nâng xe đạp, rồi đạp xe.
• Tôi nâng xe đạp, sau đó đạp xe.

Among these, rồi is short, common, and very natural in everyday Vietnamese when describing one action followed by another.