A teacher of Class III is presenting new vocabulary to the learners. Which one of the following is an effective way to present the new vocabulary ?

1. The teacher should give them a concise definition of words.
2. The teacher should try to explain a word’s meaning in the situation in which it occurs.
3. The teacher should write its meaning on the blackboard and ask learners to learn it by heart.
4. The teacher should tell them the antonyms of words and give the meaning in their language.