What does "as of" mean? I suppose as of=from particular period of time For example: as of next month price of gold increase by 50%

What does this sentence mean? "that's about as well as anybody can do" it's from Home alone movie

Is that sound natural? "i particularly agree with this expression out of all" is that sound natural?

How to use "out with" What does "out with" mean? I saw some sentence: Out with boss;Out with client.

Please help me with sentence below "why you didn't give Mary a cookie, now i think you love her less than Tom, pay attention to both" is that sentence grammaticly correct? Thanks in advance