suddenly放在句首后面用一般过去时。
Suddenly I remembered that my friend's birthday is today.
我突然想起来我朋友今天过生日。
Suddenly the signal cut out and I couldn't finish the phone call.
突然信号切断了，我没法继续通话。
Suddenly the car accelerated.
突然车加速了。
Suddenly the screen went blank.
屏幕突然变成一片空白。
