Mi amigo Fernando dice que las matemáticas son difíciles, pero yo creo que (ser/estar) (adjective)

Incorrect. the right answer is "su nieto estudia la lecciòn"

Anybody planning on traveling to a spanish-speaking nation sometime in the next months or so have to make a program so that can make a dissent conversation in spanish or just to understand when folks talk to them due to the fact by the time your trip rolls around you must be conversationally fluent or rather near to it with the assist. hope this