"I am ill and can't go to school tomorrow."
"I am sick and I can't go to school tomorrow."
"Being sick/ill,I can't go to school tomorrow."
"Because I get ill,I can't attend school tomorrow."
"I am not able to attend school for my illness."
"It surprised me that he could speak English that fast!"
"His fast pace/high speed of speaking English surprised me."
"He spoke English so fast that I got surprised."
"He spoke English too fast so that I got surprised."
"So fast did he speak English that I was surprised."
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