Sentence: We can see from the chart that local calls are the most popular and mobile calls are less popular throughout the period, but the situation tend to change, as mobile calls, having relatively low numbers at the beginning of the period from 1995 to 2000 rapidly become much popular during 2000s, with almost 10 times more minutes of calls in 2002 than in 1995.

Error: are
Error type: Tense semantics

Error: become
Error type: Tense semantics

Error: tend
Error type: Tense semantics