Things to consider when using drills:

• Use known vocabulary
• Don't spend too much time on drills
• Use pictures or objects
• Keep stress and intonation natural
• Adapt drills to your learner's needs
• Use drills in conjunction with other teaching strategies

Benefits of using drills:

• Learn grammar without "grammar talk"
• Help learners internalize new structures
• Increase accuracy
• Increase fluency/speed