To strengthen the effectiveness of approximate reasoning in fuzzy modus ponens (FMP) and fuzzy modus tollens (FMT) problems, three approximate reasoning schemes with aggregation functions are developed and their validity is respectively investigated in this paper. We firstly study some properties of fuzzy implication generated by aggregation function. And then present an $A$-compositional rule of inference (ACRI) as an extension of Zadeh's CRI replacing $t$-norm by an aggregation function. The similarity-based approximate reasoning with aggregation functions is further discussed. Moreover, we provide the quintuple implication principle (QIP) method with aggregation functions to solve FMP and FMT problems. Finally, the validity of our proposed three approximate reasoning approaches is respectively analyzed using GMP rules in detail.