What are the roles of microfilaments?

Amoeboid movements (by converting ATP into mechanical energy by ATPase at the plus side with nucleation and at the minus side for depolymerization causing movement maybe with the help of myosin in the cell cortex appear as networks, or as bundles with IFs) pseudopods (lamellipodia), internal support of microvilli and cause their movement, intracellular transport, can be involved in motility of cell.