简单过去时式
The simple past tense is used for actions
which took place at a given time in the past. We use words like yesterday, last night, last week, just now
to show the past. 
简单过去时式用于在过去的某个时间进行的动作。我们用 yesterday、last night、last week、just now 等词来显示过去时式。
Actions that denote the past
can be in the regular or irregular form.
简单过去时式的动词可分规则和不规则两种。
e.g.
| 
Regular Verb 
规则动词 | 
Irregular Verb 
不规则动词 | 
| 
  smile  → smiled 
  bake    → baked 
  laugh  → laughed 
  clean   → cleaned | 
  speak  → spoke 
  drink  → drank 
  catch  → caught 
  swim   → swam | 
There are some specific rules
for the formation of regular verbs in the past tense form:
规则动词的简单过去时式可根据以下几种方式构成:
**  add ‘ed’ to
regular verbs;
      在规则动词后加“ed”;
      e.g.    cook → cooked
                 help → helped
**  add ‘d’ to verbs
that end with an ‘e’;
     在以“e”为结尾的动词加“d”;
      e.g.    tie → tied
                
close → closed
**  if the verb ends
with a ‘y’ and a consonant 
      precedes the ‘y’, change the ‘y’ to ‘led’;
      在以一个辅音字母和“y”为结尾的动词后,
   把词尾“y”换成“ied”。
      e.g.    cry → cried
                 try → tried
Some verbs do not change their form.
有些动词的形式保持不变。
e.g.    cut → cut
           hit → hit
 


