This lesson contrasts the Past simple with the Past   continuous through very clear examples and    controlled exercises. It specifically revises sentences   with two clauses, one using the Past simple and one   using the Past continuous. To link these it presents   the conjunctions  when  followed by the Past simple   (to talk about a short action) and  while  followed by the   Past continuous (to talk about a long action). 

 • The spelling rules relating to the formation of the Past   continuous will probably be familiar to your students,   but you may wish to revise them nevertheless. They   are as follows.  In most cases we simply add  -ing  to the infinitive of the verb to form the Past continuous. However, there are three exceptions to this rule:  

• Infinitive ends with consonant + stressed vowel +   consonant: double the consonant, e.g.  stop ,  run  and    begin  which become  stopping ,  running  and  beginning . 

 • Infinitive ends with vowel + consonant + - e : omit the    -e , e.g.  write ,  have  and  come  which become  writing ,    having  and  coming . 

 • Infinitive ends with  -ie :  -ie  changes to  -y , e.g.  lie  and    die  which become  lying  and  dying . 

 • Students are also introduced to a group of stative   verbs ( know, understand, like, love, want, have, hear ),   which are rarely found in the continuous form. This is   the first time students have seen these in  Next Move    so be prepared to help students with the possible   complications posed by these forms.