1. 句末有了 as well,代替了 also,所以就不要再用 also。
2. 以下4句表达都正确。not only ... but (also) ...,这个成对的并列连词,所接的成分可以不对等。
I not only spoke English very carefully, but very clearly as well.
I spoke English not only very carefully, but very clearly as well.
We go there not only in winter, but also in summer.
I not only go there in winter, but also in summer.
She is not only good at mathematics,but (also) interested in English (as well). also 和 as well 只保留一个,也可以都不用。