沒有suggest sb to do這種說法，所以無法區別。suggest是及物動詞，后面只能跟名詞或者動名詞，所以不能用to do，只能是suggest sb. do sth.。
1、suggest sb. do sth. 建議某人做某事
【例句】Tom suggested （that）she (should) go to see a doctor.
湯姆建議她應該去看醫生。
2、suggest doing sth. 建議做某事，接動名詞作賓語。
【例句】He suggested going out for a walk.（他提議去外面散散步。）
★注意：suggest 不可以加不定式，所以上面的句子不可以這樣寫：He suggested to go out for a walk.
擴展資料：
suggest的其他用法：
1、可接名詞作賓語，suggest sth 建議某事
【例句】She suggested an early start.（她建議早一點出發。）
2、可接that 賓語從句，that從句用should+動詞原形，其中的should 可以省略，suggest +(that )+主語+(should) do+sth。
【例句】He suggested that you should go there tomorrow.（他建議你明天應該過去。）
3、在主語從句It is suggested that... 及名詞suggestion 后面表示具體建議的表語從句、同位語從句都應用should+動詞原形，should可以省略。
【例句】It was suggested that we (should) give a performance at the party. （人們建議我們在晚會上表演節目。）