@Jack: But I cannot send you messages privately on italki since that button does not work...

So would you like to join us?@ Jack

The first phrase is not really used very often in my daily life,but yes,we do use that sometimes when you wanna urge someone.Like "都这时候了，还没想好。” （You haven't thought about it carefully till now)。However,都这时候了 can also be replaced as 都到现在了，this phrase has the same meaning and is also commonly used in our daily life. 都什么时候了 uses rhetorical question to express the person is really mad at you not being hurry or something hasn't happen when it should.I will say this is more commonly used since we have many phrases and sentences that use rhetorical question and you usually hear people say that in China. For example, "都什么时候了，珍妮还没来?” （What time is it now but why Jenny still hasn't showed up?）You use this daily expression when something should have happened by the time you say that.

Is this Chinese sentence correct?

在秋天树的叶掉了。秋天，树上的叶子落了下来。（In autumn leaves fall from three) 地上的公园的树叶叶很多。公园的地上有很多落叶（There are many leaves on the ground in the park)

Well,all of these three words can be translated to"if",and all of the three are commonly used words in our every-day lives,but they can be used differently,according to the situations and what you wanna express."要是“ is more commonly used in spoken Chinese and may sound a bit weird if you use that in written Chinese especially on formal occasions.On the other hand,假如is more commonly used in written Chinese and formal occasions and it might sound weird if you use 假如 when you make a random conversation with your friend, 如果 can be used both on formal or informal occasions .For example,you can say to your friends either"我要是学习用功肯定能通过上次考试“or 我如果学习用功肯定能通过上次考试（I would have passed the last exam for sure if I studied hard).But it sounds a bit weird if you say我假如学习用功肯定能通过上次考试.And if you write an essay or anything in Chinese with the title :If I were a millionaire,then you can either say 假如我是百万富翁，or 如果我是百万富翁，but it sounds a little strange and very informal if you say 要是我是百万富翁。

Correct mistakes in my letter, please

Hi Grace,

Thanks for your letter! It was(is) good to hear from you. I'm really sorry to read that you are bored because it has been raining for such a long time in your region.

I'd like to say that I'm preparing for my exams now. That's why I don't have a lot of free time, in case if you are wondering why I hadn't (haven't)written to you for ages. I hope you'll understand me, because exams(the  exam) are so(is  such  an) important part in(of) my life.

Despite on(of) the weather, I have a lot of kinds of work indoor. (indoors)As you already know, I also have home duties. Usually I help my parents in daily routine. Besides, I have a hobby. I like  reading and now I've started to read the book presented by you.

Fortunately, this hobby is yours too. And I can get you some  advice on how to be more exciting(excited) in rainy days. First of all, you can imrove(improve?) your knowledge by watching TV. Try to find some shows that are full of information and interesting at the same time. In addition, you can find out which albums had(have) come out recently and listen to it(them). I'm looking forward to your reviews in the next letter.

Keep in touch, Artem.