+0

Hi! Number 1 is a well written sentence. How is 2,3 and 4? Are 5,6 and 7 wrong? Thanks, Fulvio

1. The reason he is so happy is that he won the lottery.

2. The reason that he is so happy is he won the lottery.

3. The reason he is so happy is he won the lottery.

4. The reason that he is so happy is that he won the lottery.

5. The reason why he is so happy is that he won the lottery.

6. The reason why he is so happy is he won the lottery.

7. The reason he is so happy is because he won the lottery.

+2

1. The reason he is so happy is that he won the lottery. OK.

2. The reason that he is so happy is he won the lottery. Not so good.

3. The reason he is so happy is he won the lottery. Not so good.

4. The reason that he is so happy is that he won the lottery. OK.

5. The reason why he is so happy is that he won the lottery. OK.

6. The reason why he is so happy is he won the lottery. Not so good.

7. The reason he is so happy is because he won the lottery. Not correct.


It's almost too casual to drop "that" when you have a clause after a linking verb, as in 2, 3, and 6.

... reason ... is because ... has always been regarded as incorrect, as far as I know.

... reason why ... is acceptable. It's analogous to several other such combinations: thing that, person who, place where, time when.

According to the Google Ngrams Viewer, ... reason why ... is used more often in published works than ... reason that ....

CJ

Comments  
yellowstarstruckNumber 1 is a well written sentence.

well-written

yellowstarstruckHow is 2,3 and 4?

"How are …?" They are fine.

yellowstarstruckAre 5,6 and 7 wrong?

I think so. You hear "reason why" and "reason is because", but they strike me as inferior wordings to be avoided.

 CalifJim's reply was promoted to an answer.