It has been 5 years since you knew him.
Read more: It_has_been_5_years_since_you_knew_him._Is_this_sentence_grammatically_correct
No, the correct phrasing would be "It has been 5 years since I have known him."
No, the correct phrasing should be "for the last 10 years" to indicate a period of time that has lasted up to the present moment.
No
No.
No. It is a sentence fragment.
No. The proper phrasing would be:"I haven't been with my daughter for four years (now)." (now is understood)The word since is used to date from a specific past event or time, e.g."I haven't been with my daughter since my divorce four years ago.""I haven't been with my daughter since 2008."It can also be phrased colloquially using since to introduce a clause:"It has been four years since I was with my daughter."(meaning it has been four years since the last time I was with my daughter)
No that isn't grammatically correct. You should say 'Though George didn't like the school, he studied in the same school for ten years'
Sentence is understandable but not correct. A correct version that can possibly be used would look like "I've been busy with the Dutch language since two years ago". The reason the original sentence doesn't work is because 'am' is describing the present tense but 'since' describes the past, so there is conflict.
No, that sentence is not correct. That sentence should be: If you have been in love for 6 years.
Schoolteachers would tell you that it is forbidden to begin a sentence with the word 'and'. This could well be a myth as writers have been using it this way for many years. However, you should be encouraged to form more complex sentences by not allowing the use of a conjunction to start a sentence
To turn a sentence fragment into a complete sentence, you need to add the necessary components such as a subject and a verb. Look for the subject of the fragment and then add a verb to complete the action. Make sure the sentence expresses a complete thought and is grammatically correct.
You have loved for six years