What are the rules regarding the use of too and also? I have read some relevant answers, but none made it clear.
If someone says "my phone is working", what should I reply?
Mine is working too
Mine is working also
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Both "too" and "also" can be used as adverbs at the end of a clause like that and have the same meaning.
"Also" can also be used as a normal adverb. Like in the first sentence of this paragraph: You can say, "The word can also be used ...", but you CAN'T say "The word can too be used ..."
Finally, "also" can be used as a conjunction. "We need to clean the house. Also, we want to mow the lawn." Use of "too" as a conjunction is archaic.
Mine is working too or mine is working also?
Grammatically and semantically, both sentences are correct. The only difference between them is as follows:
1- It's common and natural to use "too" at the end of a sentence, whereas also is not much used so and and is not considered natural if used at the end of the sentence. Also is normally used before a verb, after an auxiliary verb and sometimes at the beginning of a sentence.
2- The use of "also" is a bit formal. On the other hand, the use of "too" is much more natural and common in spoken and informal English.