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.

          Wǒ shuō tā le, xià zhōu lái.
False: 她了,下周来。
          Wǒ ɡàosu tā le, xià zhōu lái.
True: 告诉她了,下周来。

The predicate verb here may be considered to have two objects, with one referring to the person(他);The other referring to the event(下周来). We replace 说 by 告诉.