Определите видовременную форму глаголов и укажите их инфинитив.
1. The advantages of the high-speed ground transport are obvious.
2. Steel replaced iron everywhere in the rail construction .

1 present simple  - to be

2 past simple - to replace

1. The advantages of the high-speed ground transport are ( Present Simple Active Voice; to be- инфинитив) obvious.

2. Steel replaced ( Past Simple Active Voice ; to replace - инфинитив ) iron everywhere in the rail construction