I determine the cost of construction costs. I determine construction costs.

Должностные обязанности являются общими, поэтому мы предпочитаем использовать множественное число.

I have worked inat my company since 2011. I have worked at my company since 2011.

"In" is OK, but "at" is more natural.

I have worked inat my company since 2011. I have worked at my company since 2011.

I like my job and don`'t plan ton change iting. I like my job and don't plan on changing.

I like my job and I don`’t plan to change quit. I like my job and I don’t plan to quit.

I like my job and don`'t plan to change it. I like my job and don't plan to change it.

I`m 47 years old. I`m 47 years old.

I`’m 47 years old. I’m 47 years old.

I`'m 47 years old. I'm 47 years old.

When you're writing contractions (like "won't" or "I'm" or "you're"), use an apostrophe, not a backtick. They're pretty similar symbols, I know. On an American English keyboard, the apostrophe (') is located left of the enter key, and the backtick (`) is located directly above the tab key.

I am of average height. I am of average height.

I am of average height. I am of average height.

I am of average height. I am of average height.

I have got brown hair and grey eyes. I have brown hair and grey eyes.

I have got brown hair and grey eyes. I have brown hair and grey eyes.

I have got brown hair and greay eyes. I have brown hair and gray eyes.

"gray" ← американский "grey" ← британский Я американец и я писаться "gray."

I have got brown hair and grey eyes. I have brown hair and grey eyes.

My hometown is Sankt-int Petersburg. My hometown is Saint Petersburg.

Мы тоже пишем "St. Petersburg."

I like to walk the streets and parks ofin the city. I like to walk the streets and parks in the city.

I`'m married and I have a son. I'm married and I have a son.

I`'m married and I have a son. I'm married and I have a son.

I`’m married and I have son. I’m married and I have son.

I`'m married and I have a son. I'm married and I have a son.

I have never been in Great Britain or any other English-speaking countries. I have never been in Great Britain or any other English-speaking countries.

I have never been into Great Britain or any other English-speaking countriesy. I have never been to Great Britain or any other English-speaking country.

I have never been into Great Britain or any other English-speaking countries. I have never been to Great Britain or any other English-speaking countries.