1.expand "展开,扩大", 不仅指尺寸的增加,还可指范围和体积的扩大.本词的记忆应从本意"膨胀"出发记忆,效果会更好.

His ambitious expands.

As children grow older they expand their interestes and become more confident.

2. extend "伸出,延伸", 指空间范围的扩大,以及长度,宽度的朝外延伸,也可指时间的延长.重点应注意时间和空间的延伸.

The road outside the village extends to the south.

The rainy weather extended to November.

3. spread "伸开,传播", 一般指向四面八方扩大传播的范围,如传播(疾病),散布(信息),着重于传播和散布.

The rumour spreads quickly all over the town.

H1N1 spread fast all over the world in one year.

4. stretch "伸展,拉长",一般指由曲变直，由短变长的伸展，不是加长。重点在形状的变化.

He strethed out after a long time's work.

The cat stretched out in front of the fire.