red is what I removed, everything in side the blue brackets is what I replaced it with.

If there is only red with no blue following it, it means that you can just remove it.

If there is just blue text, that means just add that in without removing anything

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Today i (I)...

Today i (I) went to the downtown, to study and meet some friends, (and) then i (I) went home.
Clementina, my dog, was waiting for me, she (. She) was very playful, so i take (I got) some toys and play with she, i (played with her. I) gave she (her) a bath, and food. Now i'm (I'm) writing about it with my amateur english

Someone can help me ?
My writing is very bad?

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Notes:

1) i : Not sure if you know, or if you just did not want to capitalize the I's (we all do it), but in English the word "I" is capitalized, even if it is like this: "I'm"

2) to the : "to the" in the first sentence (highlighted red) is not necessary. Being a native English speaker, I cannot actually think of why, but that is the way it is. (Maybe someone can help answer the exact reason?)

3) , : The 2 red commas are unnecessary, but the second comma should be replaced with an "and"

4) i take : I changed to "I got". Could also be "I picked up". This is a past event, so the verbs should be in a past form

5) play with she : it is passed tense still, so it is "played". It is "her" instead of "she" because "she" is a subject pronoun. This means that "she" can only be used as the subject of the sentence. "Her" is an object pronoun which means that "her" is the thing that you are playing with.

6) she : Same as the previous. "I gave her a bath". "I" is the subject pronoun, and "her" is the object pronoun.

I hope this helps. If you have any questions don't hesitate to ask, and keep on learning :)

Below is the paragraph with my changes incorporated:

Today I...

Today I went downtown to study and meet some friends and then I went home.
Clementina, my dog, was waiting for me. She was very playful, so I got some toys and played with her. I gave her a bath, and food. Now I'm writing about it with my amateur english.

*Comment:

Your entry contained no spelling errors and had a good chronological order to it. This was a good submission. Continue practicing! J

Corrections were made on your punctuation and grammar. Please compare my ‘corrected entry’ below to your entry.

-Note- The style of writing can affect an entry’s grammar. Reading and writing more are great ways to improve your English.

**

Today I ...

Today I went downtown to study and meet some friends, and then I went home.

My dog Clementina was waiting for me. She wanted to play, so I took some toys and played with her. Later I gave her a bath and some food.

Now I’m writing with my amateur English

Can someone help me?

Is my writing bad?

**

Today i ...

Today I went to the downtown to study and meet some friends, then I went home.
Clementina, my dog, was waiting for me and she was very playful, so I took some toys and played with her, i and gave her a bath and food. Now I'm writing this with my amateur English. 

Someone can help me ? Can some one help me? Yes.
My writing is very bad? Is my writing very bad? No!