Page 70 - Practical English Usage 3ed - Michael Swan, Oxford

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also, as well, too and either in negative clauses negative + negative: either
After mentioning a negative idea or fact, we can add another negative point by using not . .. either.
Peter isn't here today. John isn't here either. (NOT )'Bhll isn't here neithei".) Also, as well and too are not normally used with not in this way.
You can't have an apple, and you can't have an orange either. (NOT ••• alla16ft etCn't Mile an Bfflnge al:!B I tiS weill 100;)
affirmative + negative: also / as well / too
After mentioning an affinnative (non-negative) fact or idea, we can add a negative point by using not ... also, not ... as well or not . .. too.
You can have an apple, but YOIl can't have an orange too. He drinks too much, but at least he doesn't smoke as well.
alternate(ly) and alternative(ly)
Alternate(ly) means 'every second', 'first one and then the other', 'in turns'. We spend alternate weekends at our country cottage.
I'm alternately happy and depressed.
Alternative(ly) is similar to 'different', 'instead', 'on the other hand'. Janet's not free on the 27th. We'll have to find an alternative date.
You could go by air, or alternatively you could drive there.
although, though, but and however: contrast although and though: conjunctions
Soth these words can be used as conjunctions, with the same meaning. In informal speech, though is more common. They introduce an idea ('N) with which the main clause ('B') is in contrast. When we say'(Al)though A, S', there is something unexpected or surprising about'S'.
(Al)though (A) I don't like him, (B) I agree that he's a good manager. (B) I'd quite like to go out, (al)though (A) it is a bit late.
but and however
We can give the same meaning by putting but or however with the contrasting, 'unexpected' clause ('S').
(A) I don't like him, but (B) I agree that he's a good manager.
(A) I don't like him. However, (B) I agree that he's a good manager. (A) It is a bit late, but (B) I'd quite like to go out.
(A) It is a bit late; however, (B) I'd quite like to go out.
but and however: the difference
But is a conjunction: it joins two clauses, and comes at the beginning of the
second. However is an adverb: it does not connect its sentence grammatically
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