Jawapan

2016-08-12T10:24:13+08:00
Are untuk present tense ,were untuk past tense
kalau ayat ni ---> Descriptive analysis about mean and standard deviation are used to identify the variables of these studies to answer the research questions.
2016-08-12T12:40:13+08:00
Are and were are same 

ARE is used on present  
WERE is used on past 
*this 2 are called verb to be and they must used for plurals and countable things