This is quite a common mistake along with the similar;
× A ten dollars bill.

Everyone knows that in English we have;
○ One dog, two dogs, three dogs.
○ One year, two years, three years.

But here dogs and years are nouns. (and are countable.)

In the sentence above;
A ______ Bill - is the noun
Ten-dollar - is the adjective.

Remember adjectives describe nouns. And they are not countable.

It is like big or small, or fast or rich.
○ One big cat.
× Two bigs cat.
○ Two big cats.

So as ten-dollar, and two-year old are adjectives we don't use an S with them.   We use them just like regular adjectives.

Notice we have A_____Noun.
○ I have a two-year old child.
○ Give me a ten-dollar bill.
○ I need a five-pound note.
○ I went on a three-week vacation.
○ It is a ten-minute walk from the station.
○ I live a 10-minute drive from the beach.


Here this sentence is correct.   But the mistake comes from the word play. Basically in English only children play. (Playing sports is different.)
○ My daughter likes playing with dolls.
○ Go and play outside in the snow.
○ My son played on the swing.  (ブランコ)

私は友達と遊ぶのが好きです is ok in Japanese but in English it sounds strange if you are older than 7! And very strange if you are a middle-aged man.

For teenagers they might say;
○ I like to hang out with my friends.

For Adults you should say.
○ I like to spend time with my friends.
○ I like drink beer with my friends.
○ I often play golf with my friends.


Here staff is not one person, but all the people together.
So we use the word like it is a singular noun.
○ The staff is very kind at my company.
○ We need more staff.
○ We have a staff shortage. 人手不足


‘I go to home’, there is an adverb not a noun. So we cannot go to there. Here is also an adverb. We must say.
○ I have never been there.
○ I have never been here before.


This is a very common mistake that many many people make. Many people know the phrase;
○ I have never been to Paris. パリに行ったことがありません。
But the mistake is that ever is not the opposite of never. We cannot say.
× I have ever been to Paris.  パリに行ったことがあります。

We must say;
○ I have been to Paris.  パリに行ったことがあります。

In all of these sentences we must use the past participle 過去分詞;

For example; eat ate eaten
○ I have eaten Frogs legs.
○ I haven't eaten Frogs legs.
○ I have never eaten Frogs legs.

I haven't and I have never are very similar but never means in all of my life. "I haven't" can be used for shorter time periods.
○ I have never (in my life) met a famous person.
○ I haven't been to Disneyland this year.
× I have never been to Disneyland this year.
○ I have never been to Disneyland. (In my life)