

そんなに心配することはないですよ。
何をそんなに心配するの?
連絡しないと、母が心配するよ。
"しんぱいする(心配する)" is in the lesson "Verbs 17" (Level 29), along with 10 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.