haha ha sakana wo yaku mae ni, itumo kankisen wo tukemasu.

A natural reading is:

Haha wa sakana o yaku mae ni, itsumo kankisen o tsukemasu.

A few pronunciation notes:

• 母 is はは here.
• The particle は is pronounced wa, not ha.
• The particle を is pronounced o in modern Japanese.
• So 母は sounds like haha wa.

When talking about your own mother to someone else, Japanese usually uses 母 (はは) rather than お母さん.

Very roughly:

• 母 = my mother / one’s mother, used in neutral description
• お母さん = mom / mother, often used when addressing her directly or referring to someone else’s mother more politely

So in a textbook sentence like this, 母は is the normal choice.

Because Japanese often leaves out information that is obvious from context.

With family words, this happens a lot:

• 母 often already implies my mother
• 父 often already implies my father

So 母は is often enough. If you want to be extra explicit, you can say 私の母は.

は marks the topic of the sentence.

So 母は means something like:

• As for my mother...
• My mother, ...

It does not simply equal English is. It tells the listener what the sentence is about, and then the rest gives information about that topic.

Because there are really two verb phrases here, and each verb has its own object:

• 魚を焼く = grill/cook fish
• 換気扇をつけます = turn on the ventilation fan

So:

• the first を belongs to 焼く
• the second を belongs to つけます

This is very normal in Japanese when one clause is inside another.

Before 前に, Japanese normally uses the plain dictionary form of the verb:

• 食べる前に = before eating
• 行く前に = before going
• 焼く前に = before grilling

So verb dictionary form + 前に is the standard pattern.

By contrast:

• 焼いて前に is not correct here
• 焼くの前に is also not the normal pattern

A useful comparison:

• 魚を焼く前に = before grilling fish
• 食事の前に = before the meal

So:

• verb + 前に
• noun + の + 前に

前 means before.

In this sentence, 前に marks the time before another action happens. So 魚を焼く前に means before grilling fish.

The に helps mark that time point. In this pattern, 前に is the normal form.

Yes, that is the natural interpretation.

In Japanese, when no new subject is introduced, the listener usually assumes the same subject continues. So this sentence is understood as:

• Mother grills the fish
• Before doing that, mother turns on the ventilation fan

If the fish were being grilled by someone else, Japanese would usually say so explicitly.

For example:

• 母は、父が魚を焼く前に、換気扇をつけます。 = My mother turns on the fan before my father grills the fish.

焼く is a broad cooking verb. Depending on context, it can mean things like:

• grill
• broil
• roast
• bake

With 魚, it is often understood as grill or broil.

So the exact English word can vary, but the Japanese verb stays the same.

換気扇 means a ventilation fan or exhaust fan, especially the kind used in a kitchen to remove smoke and smells.

It is not the same as:

• 扇風機 = electric fan / room fan

In this sentence, it is the kitchen fan used before cooking fish.

The verb つける has several related meanings, including:

• attach
• put on
• switch on

With appliances, lights, TVs, air conditioners, fans, and similar things, つける commonly means turn on.

Examples:

• 電気をつける = turn on the light
• テレビをつける = turn on the TV
• エアコンをつける = turn on the air conditioner
• 換気扇をつける = turn on the ventilation fan

So this is a very common and useful verb pattern.

Because Japanese non-past forms cover several meanings, including:

• present
• future
• habitual/repeated actions

Here, いつも makes it clear that this is a habitual action. So つけます means something like always turns on.

Also, ます makes the sentence polite.

いつも is an adverb, and Japanese adverbs are fairly flexible in position.

This sentence has:

• 母は魚を焼く前に、いつも換気扇をつけます。

You could also say:

• 母は、いつも魚を焼く前に換気扇をつけます。
• 母は魚を焼く前に換気扇をいつもつけます。
  This is possible, but less natural than the others.

The original placement is perfectly natural. It emphasizes that turning on the fan is something she does regularly.

In normal Japanese writing, you would usually write this without spaces:

母は魚を焼く前に、いつも換気扇をつけます。

About the punctuation:

• The comma after 前に marks a pause and makes the sentence easier to read.
• It is helpful, but not absolutely required in every context.

About the spaces:

• Standard Japanese normally does not use spaces between words.
• Textbooks often add spaces to help beginners see the parts of the sentence more clearly.