Verb conjugation of "smash" in English

The connecting flight to Phuket was fully booked, and the connection to Krabi had five empty seats. The problem was that the boarding began in ten minutes and I did not even have a ticket.
You have to be careful when you go on summer vacation. There are many dangers but the most dangerous one is the sun itself, because if you're not careful it may harm you. People underestimate the rays.
That's a great deal. I know that in the beginning it is difficult to have conversations, especially if you're not stable with vocabulary. Actually, your English does not seem so bad. Have you ever taken a course?