perhaps

"John and I have been friends ever since we were roommates at college.   Trust is important between friends.   I used to find it hard to make friends when I was shy."

"The reason for my late arrival was a flat tire. "

"The early arrival of the bride created a stir."

"My concern for my daughter's health is significant because she's been feeling unwell lately. "

"Except for one or two days a year, he usually walks to work."

"There's a lot of uncertainty about the final exam's topic, so students are studying everything. "

"My certainty about my ability to finish the project before the deadline was high. "

"My brother is always punctual for his morning meetings. "

"The local library has a wide selection of books for children and adults. "

"The guard blew his whistle to indicate imminent departure."

"My dinner was a sandwich and some fruit, before I went to my afternoon class. "

"The tailor modifies the pants to make them shorter. "