Grammar

1)If it were winter, we would ski be skiing. (Assuming you are talking to someone with the same thought. If not it should be 'I')
2)If she had phoned me yesterday, I would bring a have brought a/the book. (A/the, 'a' if it was undecided and 'the' if it was a specific book you and the person were phoning about)
3) If I had more spare time today, we I would play chess with you.
4) We would read english books bin in their  original language if we know knew English better.
5) If I were you, I wouldn't refuse to take part in the competition.
6) Anna could recite this poem if she know knew it by heart.
7) If you come came at 7 o'clock yesterday, you would catch have caught me at home.

Just remember that if you are talking about something that has happened or is from the past, you should use past tense. So situations referring to yesterday should be in the 'past' and not 'present' tense. 

Grammar

1)If it were winter, we would go skiing. 

( действительно, to ski- это глагол и означает он кататься на лыжах, но прожив какое-то время в Америке, я убидилась, что чаще всего носители используют to go skiing...что означает професионально, либо часто заниматься, используется с разными глаголами : to go swimming, to go shopping...)

2)If she had phoned me yesterday, I would have brought a/the book.

( 3 тип условных предложений, когда чувствуется сожаление, но изменить ничего нельзя, так как ситуация была в прошлом; напомню формулу If+Past Perfect, :)+ would have+ V3/ed )

3) If I had more spare time today, we would play chess.

4) We would read English books in their original language if we knew English better.

(это классическое предложение 2 типа, нереальное условие в настоящем времени: "мы бы читали..., если бы знали...", но в сущности нам не хватает знаний, чтоб выполнить действие;

вспомним формулу If + Past Simple/ Past Continuous, :)+would+V 

В нашем случае условие стоит в середине предложения- перед If запятая не ставится)

5) If I were you, I wouldn't refuse to take part in the competition.

(2 тип, хочу обратить Ваше внимание на артикль the competition, Вы правильно написали refuse to take part in, дело в том, что после refuse всегда используется глагол с частичкой to, в комментариях выше американка Вам советует взять refuse taking- это не соответствует грамматики, хотя должна согласиться, что в Штатах я постоянно это слышу((((

6) Anna could recite this poem if she knew it by heart.

( 2 тип)
7) If you had come at 7 o'clock yesterday, you would have caught me at home. 

(3 тип, упущенная возможность)

П.С. если Вам нужна помощь в грамматике- буду рада помочь:)

Grammar

1)If it were winter, we would ski.
2)If she had phoned me yesterday, I would have bring brought a book.
3) If I had more spare time today, we would play chess.
4) We would read English books bin in their originality if we know our English is better.
5) If I were you, I wouldn't refuse to take taking part in the competition.
6) Anna could recite this poem only if she knows/knew it by heart. [in using present tense, it means that it is still a fact that she does not know it by heart yet]
7) If you come at 7 o'clock yesterday, you would have caught catch me at home.