"It's been an intensive few weeks" Is the phrase "It's been an intensive few weeks for us" correct? My colleague did use that in an e-mail, but it feels strange to me... yet more natural. It's confusing for sure. First, the subject (few weeks) is in plural form, so there shouldn't be any "has", as far as I know. Second, there is "an" before the subject which also shouldn't appear before a plural subject. Am I right?

Is there a word for a work which results might be awesome but is needless? I tried to explain my colleague today that a feature he'd like to implement in a program is awesome, but not needed for the customer. Which word should I use? I thought about overshot, over the top, overhead. Is any of these accurate?

Hell has frozen/froze/freezes over? What is the right time to use freeze over in a sentence where I wish announce that hell is now frozen over and that's the reason for another thing to occur? a) Hell has frozen over! Now we can feast. b) Hell froze over! Now we can feast. c) Hell freezes over! Now we can feast. I'm suspecting that I should use "has frozen" but is that correct?

Two verbs in one sentence - "to" or ~ing I always have troubles remembering and determining if I have to use "to" + Infinitive or rather verb + ~ing in two verb sentences (not sure how English native speakers call such phenomena). But guess I found the general rule I can remember. But... is this correct? - use verb + ~ing when you could place "that" in between - example: "If you decide (that) playing the game is a nice hobby... (then something)" - use "to" + Infinitive when you can't place "that" in between - example: "If you decide to play the game, ... (then somehing)".

"Busy" - is "beyond regular busines" a correct phrase? If I would like to say that my week is more busy than regular, can I use "busines" word in this sentence?: Sorry for the delay, it is a busy week - even beyond regular "busines" to be honest. Is it a real word? I'm quite curious. Can't find anything related via Google as it always correct the word to "business" ;/ Thank you in advance!

Is "the sale is on the go" a correct phrase? Let's say I would like to tell my friend that the Black Firday sale is almost here, but the other sale just started and is in the process. Is this phrase correct? It's almost Black Friday and the Flea Market Sale is on the go. Can I use on the go in such context?

"Don't dare to touch" or "touching"? I always have troubles determining if I have to use to +. Infinitive or rather verb + ~ing in such sentences. So.. should one say: A) Don't dare to touch it, it's hot! B) Don't dare touching it, it's hot!

"X is everything which Y isn't" Is this sentence correct? "X is everything which Y isn't" - Y is lacking all the best features of X; X is far more better than Y

Cover Letter in English So.. I'm writing a cover letter in English but I'm unsure if all is grammatically correct. Italki offers only a 1000 letters per post, so I will include only those parts which I'm unsure. "I think that today, I have gained sufficient knowledge to taking a step ahead for a leader role". (knowledge to take?) "My daily responsibilities include menaging work of an outsourced XYZ team, providing direct help for the team (also those who work as an outsource)". "I'm currently fluent in use of XYZ, ZYX, ABC and BCA bugtrackers". (is 'fluent' a correct word in case of softwares?) "I have excellent ability to think analytically, good understanding of specializations of co-workers in a XYZ team" (is the second part of the sentence understandable or not too complicated?)