אם יש הרבה גשם, אני נוסעת באוטובוס, לא באופניים.

Because נוסעת is the feminine singular present-tense form.

So this sentence is being said by a woman or girl:

• אני נוסעת = I go / I travel / I ride (female speaker)

If the speaker were male, it would be:

• אני נוסע

Hebrew present-tense verbs agree with the subject in gender and number.

אם means if. It introduces a condition:

• אם יש הרבה גשם... = if there is a lot of rain...

Hebrew does not usually change the verb form after אם the way English sometimes does in conditionals. You just use the normal tense that fits the meaning.

יש means there is / there are.

So:

• יש הרבה גשם = there is a lot of rain

This is an existence word, not the ordinary present-tense verb to be. Hebrew often uses יש where English uses there is / there are.

Here הרבה means a lot of / much.

In this use, הרבה is a quantity word, and it does not change to match the gender of the noun after it. So:

• הרבה גשם = a lot of rain
• הרבה מים = a lot of water
• הרבה אנשים = a lot of people

A learner might expect agreement, but in this structure הרבה stays the same.

Hebrew commonly uses ב־ with means of transportation.

So:

• באוטובוס = by bus / on the bus
• באופניים = by bicycle / on a bicycle

English uses different prepositions such as by, on, or in, but Hebrew often uses ב־ for all of these transport expressions.

Because אופניים is the normal Hebrew word for bicycle, even though it has a plural/dual-looking ending.

Hebrew has a special ending ־יים that is often used for things connected with pairs. A bicycle has two wheels, and the word settled into this form. So even one bicycle is:

• אופניים

That is completely normal Hebrew.

It can match several English verbs depending on context.

The root נסע is about traveling or going somewhere. In this sentence, natural English could be:

• I go by bus
• I travel by bus
• sometimes even I ride the bus

So נוסעת is broader than any one single English verb. Context tells you which translation sounds best.

Because Hebrew is avoiding repetition.

The sentence means:

• I go by bus, not by bicycle

Hebrew does not need to repeat the whole verb phrase. A fuller version would be something like:

• אני נוסעת באוטובוס, לא נוסעת באופניים

But that sounds more repetitive. So the shorter version is more natural.

Yes, but the meaning changes slightly.

• אם = if
• כש = when / whenever

So:

• אם יש הרבה גשם... = if there is a lot of rain...
• כשיש הרבה גשם... = when(ever) there is a lot of rain...

If the speaker means a repeated habit, כש may sound more natural. If the speaker means a condition, אם is the right choice.

It is grammatical and understandable, but native speakers very often say:

• אם יורד הרבה גשם = if it is raining a lot

That is because יורד גשם is a very common Hebrew way to talk about rain falling.

So:

• אם יש הרבה גשם focuses more on there being a lot of rain
• אם יורד הרבה גשם focuses more on the weather event itself

Both work, but יורד גשם is especially common in everyday speech.

No. Hebrew word order is somewhat flexible.

The original sentence starts with the condition, which is very natural:

• אם יש הרבה גשם, אני נוסעת באוטובוס, לא באופניים.

You can also move things around, especially in speech, but the original order is clear and common. Starting with the if clause helps set up the condition first, just like in English.