Foreigners often make some strange mistakes in Chinese when they study the most difficult language--- ---Chinese. We try to analyze typical sentences to correct these errors.

          Wǒmen tònɡtònɡ kuàikuài de ké yǐ wán jǐ tiān.
False: 我们痛痛快快地可以玩几天。
          Wǒmen kéyǐ tònɡtònɡ kuàikuài de wán jǐ tiān.
True: 我们可以痛痛快快地玩几天。

描写性的词语与能源动词同时用在谓语动词的前边，往往是描写性词语紧挨着动词，其次才是能源动词。“痛痛快快地”应该移到“可以”的后边。
When both a modifier and auxiliary verb are used before the predicate verb, it usually occurs that the modifier stays near the verb with the auxiliary verb coming next. Thus, we place 痛痛快快 after 可以.