Which sentences are correct?

[zoriv]

Would you be so kind and tell me which sentences are correct, below enumerated:
1.
a) I too, cannot use this extention anymore with ........ since I installed version x Previous to this....
b) I cannot use this extention anymore with ...... too, since I installed version x Previous to this...
2.
a)I now know that you love me.
b)Now I know that you love me.
3.
a)Well my background is Italian, I myself have been born and raised in Canada.
b)Well my background is Italian, I have been born and raised in Canada.
4.
a) I sometimes come home very tired.
b) Sometimes I come home very tired.
5.
a) I am now a home schooling mother and I have taught my children to speak the same way I do.
b)now, I am a home schooling mother and I have taught my children to speak the same way I do

I'm really confused, because I've always known that all sentences under "b" were correct, but now in one forum the sentences under "a" are more used.
Your expert and linguistic answer will be welcome.
Thanks in advance.

[Tdol]

1a- either say 'I, too,' or skip the commas b) is OK, but I prefer the word order in a)
2- both are fine.
3 I would say:
Well, my background is Italian, though I was born and raised in Canada
4 both are fine
5 both are fine to me
There's flexibility with the position of words, and it can change the emphasis a bit. for example, with the second, I would use the b) version at the moment at which I learned the truth about the person's emotions- by putting the adverb fiorst I would be giving it greater emphasis.

[zoriv]

Thank you very much for detailed answer, tdol.

[Tdol]

You're welcome, Zoriv.