Learning aims:
Enable students to master some important words and phrases.
Learning procedures:
Step 1 Word formation
1.possession(n.)-___________(vt.)
2.poverty(n.)-___________(adj.)
3.commitment(n.)- ____________(vt.)
4.assistant(adj.)-_______________(vt.)_______________帮助（n.）
5.bacteria(n.复)-_____________（n.单）
