koko nara, haha ni denwa dekimasu.

なら adds a sense like if it’s here, as for here, or here, at least.

So ここなら does not just mean here. It suggests a contrast or condition:

• Here, I can ...
• If it’s here, then ...
• At this place, it’s possible ...

It often implies something like:

• maybe you can’t do it somewhere else
• but here, you can

So the sentence has a nuance of “Here, I can call my mother.”

The comma marks a natural pause after the condition/topic part.

So the sentence is divided like this:

ここなら、 | 母に電話できます。

That pause helps show:

• setting/condition first: here / if it’s here
• main statement second: I can call my mother

In speech, you would often pause slightly there. The comma is helpful, but not absolutely required.

In Japanese, when talking about your own mother to someone else, you usually say 母.

• 母 = my mother / one’s own mother, in a more neutral or humble way
• お母さん = mother / mom, often used when addressing your mother directly, or when referring to someone else’s mother in a polite everyday way

So in this sentence, 母 is natural because the speaker is talking about their own mother.

With 電話する or 電話できる, the person you call is commonly marked with に.

So:

• 母に電話する = call my mother
• 先生に電話する = call the teacher

Here, に marks the target/recipient of the phone call.

This is different from English, where we just say call my mother without a preposition.

Because 電話 here is functioning as part of the verbal expression 電話する / 電話できる, not as a direct object with を.

Common patterns:

• 電話する = to make a phone call / to call
• 電話できる = can call / can make a phone call

So:

• 母に電話できます = can call my mother

電話をできます sounds unnatural in standard Japanese.

A longer version is:

• 母に電話することができます

But 母に電話できます is shorter and very natural.

できます is the polite form of できる, which means:

• can do
• be able to do
• sometimes it is possible to do

In this sentence, it expresses possibility/ability in the situation.

Because of ここなら, the nuance is often not just personal ability, but situational possibility:

• Here, it’s possible to call my mother.
• Here, I’m able to call my mother.

For example, maybe:

• the signal is better here
• phones are allowed here
• it’s quiet enough here

Yes. Japanese often omits subjects when they are clear from context.

So the sentence does not explicitly say I, but in many situations it naturally means:

• I can call my mother here

Depending on context, it could also mean:

• we can call my mother here
• one can call one’s mother here

But in normal conversation, listeners usually understand the intended subject from the situation.

They are related, but the nuance changes.

ここで

• simply means here as the place where the action happens
• ここで母に電話できます = You can call your mother here

ここでは

• adds a topic/contrast nuance
• as for here / here, at least
• often contrasts with other places

ここなら

• strongly suggests if it’s here or here should be okay
• often implies a condition or judgment: this place works

So:

• ここで = location
• ここでは = location + contrast/topic
• ここなら = conditional/contrastive nuance, often “here should be fine”

In this sentence, ここなら sounds very natural if the speaker is deciding whether this place is suitable.

Yes, and it is also natural.

ここでなら combines:

• ここで = here, at this location
• なら = if it’s the case that / if it’s here / at least here

So ここでなら can sound a little more explicitly focused on the place where the action happens.

Compare:

• ここなら、母に電話できます。
• ここでなら、母に電話できます。

Both are natural. The difference is small:

• ここなら sounds slightly broader, like if it’s this place
• ここでなら emphasizes doing it here

It can suggest either one depending on context, but in this sentence it most naturally means situational possibility.

Possible interpretations:

• ability: here I’m able to call
• permission: here I’m allowed to call
• practical possibility: here it will work

Because of ここなら, the sentence often feels like:

• Here should work
• Here I can do it
• Here it’s possible

So the exact English wording depends on context, but the Japanese naturally leaves that a bit open.

Normally, locations are often marked with particles like で or に, but here ここ is followed directly by なら, because ここ is being treated as the basis for a condition/topic.

So this is not simply:

• at here

It is more like:

• if it’s here
• as for this place

That is why ここなら works without another particle.

If you wanted to focus more directly on the action occurring at that location, you might say:

• ここで母に電話できます
• ここでなら母に電話できます

But ここなら is perfectly natural when the idea is “this place is suitable.”