These three adverbs have the same meaning – in addition. But it doesn't mean that we use them the same way in a sentence. Let's compare ‘also’, ‘too’ and ‘as well’.
Most of all we use ‘also’ in writing. There are three positions of this adverb in a sentence.
- Front position. In this case we emphasise the idea that comes after ‘also’.
I don't want to go outside these days. Also, I think it's simply dangerous.
- Mid position. In this case we place ‘also’ between the subject and the main verb. Or after the model verb or auxiliary or verb ‘be’.
My husband likes to watch soccer but he also spends hours watching rugby.
My friend has been reading for hours during the lockdown, and she has also been watching TV a lot.
- End position. In this case ‘also’ connects the idea of the first sentence with the last one.
I tried to find the medicine in several pharmacies but I couldn't. No one could help me at the online store also.
We use ‘too’ commonly in speech. And we usually place it in the end of the sentence. In some cases we can use ‘too’ after the subject in order to show its reference directly to the subject.
Boris too decided to leave.
Sarah told us that she had a wonderful trip to Paris. I would like to go there one day too.
We use ‘as well’ commonly in speech. Rather than ‘also’. And we place it almost always in the end of the sentence.
I'd like to try on this red dress. And that pink one as well.