に先立って => before; prior to ~ N2
に[先立「さきだ」]って/に[先立「さきだ」]ち/に[先立「さきだ」]つ => Before A occurs/takes place N2
Time, Situation
ていけない => Suddenly... N3
Simultaneously
ている => Repeat N5
Continuous
ていない => have not yet ~ N4
Trend
ていては => If one keeps doing something N3
Emphasize
ている => Already done N5
Status
ている => Already...(completed) N5
Completed
ている => Used to... N5
Experience
ている => Being... (past) N4
ている => Doing something... N5
Status
てもいい => It's also possible (Possibility) N4
Ability