inability

"The student's ability to concentrate in noisy environments was crucial for success in the class. "

"My friend told me there was something in the box, but I didn't know what it was yet. "

"The divers encountered a huge school of mackerel."

"My teacher explained the new math concept, and I understood it perfectly. "

"I brush my teeth regularly to prevent them from turning yellow."

"Instruction will be provided on how to handle difficult customers."

"I think we can afford the extra hour it will take.  We can only afford to buy a small car at the moment."

"Feeling the powerlessness to stop the bully made Sarah cry. "

"My lunch options today are a sandwich or a salad. "

"The chef will french the carrots before adding them to the stew. "

"The cook attending the bonfire with kindling quickly warmed the chilly evening air. "

"The complicated instructions on the new software difficult me from completing the project on time. "