Help me with causative verbs! D:

娘に 朝ご飯 の 準備を 手伝わせて います。

I understood this sentence as "you get your daughter to help you cook".

Maybe you don't want to say that.

Do you want to say your daugter helps you cook voluntarily?

In this case, you can say

娘は朝ご飯の準備を手伝ってくれます。

Or do you want to say you ask your daughter to help you?

In this case, you can say

娘に朝ご飯の準備を手伝ってもらっています。

息子を 犬の世わを させて います。

Maybe you want to say 息子に犬の世話をしてもらっています。

毎週 息子を プールへ 行かせて います。

It's difficult....

If you force him to go to swimming pool, it's correct sentence.

If you don't want to use  any causative verbs, I can guess only "息子は毎週プールへ行っています".

Japanese causative verbs are very difficult.

"行かせる" doesn't necessarily mean causative verb.

If you allow your son to go to swimming pool, you can say "息子を プールへ 行かせて います" even though it doesn't mean causative sentence.

娘を いつも ここで 遊ばせて います。

I've understood that the general rule is: when there's an intransitive verb, the person that is allowed or made to do the action is followed by O when the verb is transitive, the particle used is NI

My problem is sometimes understanding wether a verb is trans on intrans since it's doesn't always correspond to verbs in my language. For example with the second sentence: if i translate literary into italian it says "to do the care of the dog" to do-----> what?------> the care = transitive , but i'm never sure.

I can really understand this!! When I study English, I often encounter the same problems!!

By the way, "行く" is  an intransitive verb, but you can use

～へ行く

～に行く

so it is not only "NI" but these are completely the same meaning.

会う(meet) is also an intransitive verb.

In this case, you can say

Oと会う

Just because these are sentences using an intransitive verb, all of them don't necessarily use "NI".

However, if the sentence uses "NI", the verb used in the sentence is an intransitive verb.

Rather, when there is not "wo", the following verb is an intransitive verb.

This method might be easier, right?

Transitive verbs are used as "OをVする".

e.g

ご飯を食べる

本を読む

Help me with causative verbs! D:

娘に 朝ご飯 の 準備を 手伝わせて います。

息子にを 犬の世わを させて います。

毎週 息子を プールへ 行かせて います。

娘を いつも ここで 遊ばせて います。

I've understood that the general rule is: when there's an intransitive verb, the person that is allowed or made to do the action is followed by O when the verb is transitive, the particle used is NI

My problem is sometimes understanding wether a verb is trans on intrans since it's doesn't always correspond to verbs in my language. For example with the second sentence: if i translate literary into italian it says "to do the care of the dog" to do-----> what?------> the care = transitive , but i'm never sure.

*Transitive verb needs object, in Japanese 〜を. 

The construction of the first and second sentences is the same. Let's see your sentences without causative verb. 

娘は朝ごはんの準備を手伝います。息子は犬の世わをします。

These two sentence have "object". --> transitive verb

毎週、息子はプールへ行きます。娘はいつもここで遊びます。

These two don't have object. --> intransitive verb

I wonder if I could explain well with my English. I hope this helps you and I also hope other people explain about it, too.