1
We visited also the Colosseum.
We also visited the Colosseum.
Also normally goes:
- before the main verb: ‘We also visited the Colosseum.’
- after the verb be: ‘The village is also very beautiful.’
- after an auxiliary or modal verb: ‘She has also visited Rome.’
2
I enjoyed the evening, and my girlfriend also.
I enjoyed the evening, and my girlfriend too.
In British English, we normally use too, not also, at the end. Also normally goes in the middle of the sentence.
3
Friday is my day off, and I don’t work on Saturdays also.
Friday is my day off, and I don’t work on Saturdays either.
Use either at the end when adding a second negative idea.