if /he /not study /hard /today /he /pass /entrance exam/ easily/ next month
→ If he doesn't study hard today, he won't pass entrance exam easily next month.
I/ be/ disappointed/ that you/ not phone/ me/ last night
→ I am disappointed that you didn't phone me last night.
nowadays/ it/ be/ very difficult/ study well/ without/ have/ smart phone
→ nowadays it is very difficult to study well without having a smart phone.