8.2.3　★★★词形变换★★★

1.easy adj.容易的 → easily adv.容易地

2.quick adj.很快的 → quickly adv.很快地(https://www.daowen.com)

3.neighbor n.邻居 → neighborhood n.街区；街坊

4.free adj.免费的；自由的；空闲的 → freely adv.自由地；空闲地 → freedom n.自由