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I have quite a lot of confusing sentences don't I? -_-.......

Well here goes......

1. 'All I have to do is just do it!' or 'All I have to do is to just do it!'

which one is grammatically better(?)?

2. 'Time passes by too fast' or 'Time passes too fast'

or 'Time passes too quickly' which one is better?
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For me, all are equally correct...
I'd choose
1. All I have to do is just do it
2. Time passes too quickly
but then, it's only my opinion!
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Hello
What's a lackadaisicality, please?

"Alack(=Alas) a day!"="Woe worth the day!" ... an interjection expressing sorrow.
(EX) She is dead, she is dead: alack a day! [Shakespeare : Romeo & Juliette, 1592]
It's sometimes exclaimed as "Lack-a-day", and adjectivized into "lack-a-daisical" (=sentimental, vigor-less, languish, lazy, indolent).
(EX) He was a lackadaisical student with no aim in life except for a vague desire to become a statesman.

paco
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Comments  
1. 'All I have to do is just do it!' or 'All I have to do is to just do it!' -- they are both grammatically fine. The second 'to' is unnecessary, especially in this offhand remark.

2. 'Time passes by too fast' or 'Time passes too fast' or 'Time passes too quickly' -- all again are fine. 'Fast' is slightly less formal that 'quickly'. 'Passes by' suggests to me a lackadaisicality that does not exist with 'passes', but that may be an illusion.
What's a lackadaisicality, please?
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 paco2004's reply was promoted to an answer.
Ok, thank you, Paco!