Answers<ol><li>﻿﻿The colourful parts show the areas of the brain which are very active.</li><li>﻿﻿These parts become coloured when the brain is not doing a routine task but is daydreaming and problem-solving.</li></ol>

Possible answers<ol><li>﻿﻿People often daydream at work when doing repetitive tasks or at school during lessons.</li><li>﻿﻿Daydreaming can have negative connotations but some people regard it as a positive experience which helps them to be creative.</li></ol>

Answers1 a changing situation in the present: is altering (present continuous2 an action in progress from a point in the past to now: have been studying (present perfect continuous)3 an action in progress in the past: were performing (past continuous4 an action in progress before an earlier point in the past: had been performing (past perfect continuous)5 an action in progress in the future: will be watching (future continuous)

Answers to Grammar summary exercises11 tried 2 was walking3 I'm writing 4 'll be living5 You've missed6 He's always playing 7 alwayslistens 8 finished9 tried10 didn't think21d 2b 3a 4e 5 c31а 203a40 50 6041 wasn't listening 2'll be working 3 had they been living 4've been spending 5 were having 6 will be arriving 7 has been driving 8 had been travelling51 wasn't she listening2 where will you be working3 had they been living in New York before they4 have you been spending5 were you doing when Beata6 will Luke be doing7 has Larry been driving8 had you been travelling before you realized your passport was6<ol><li>﻿﻿He's been living in London since 2012.</li><li>﻿﻿Right now, I'm trying try to repair my computer.</li><li>﻿﻿This time last year, Im was working for Exxon.</li><li>﻿﻿When she's graduating graduates from university in two years, she'll be looking for her first job.</li></ol>5 l've l'd been trying to find the office for 45 minutes when I finally got there.6 l had was having a nap when the phone woke me up.

Answers1 thinking, working, daydreaming2 thinking, for seven years3 daydreaming, for several minutes

Answers1 've been commuting 2 happened 3 was driving4 'd crashed 5 been texting 6 hadn't been paying attention 7 was / had been wandering 8 happened9 're daydreaming / daydream 10 'll be concentrating / 'll concentrate

Answersliving in Londonmet Ella for the first timegoing to the same Spanish classsaid hello to each other a few times, but never actually had a conversationone week she wasn't thererealized he'd been daydreaming about seeing her and maybe asking her outwas suddenly afraid she'd never come backthought he'd better do somethingshe came to class the following weekhe started a conversation and asked her outgoing out together since thengetting married in six months

Answers1 suddenly realize 2 're working 3 understand4 daydream /'re daydreaming5 has 6 had been thinking 7 'd been 8 decided 9 began 10 had been11 fell 12 hadn't 13 was14 won't see / won'tbe seeing 15 'll certainly see / I certainly be seeing

Answers1 l'd been living here for four years when I met Ella for the first time.2 ﻿﻿We'd both been going to the same Spanish class for several weeks.3 ﻿﻿We've been going out together since then, and in about six months we'll be getting married.

Answersliving in London and going out with Ella

Answers1 were doing2 controls3 may not have known4 will be doing5 were working on6 requires7 are constantly changing8 had never considered

Answers1B 2C 3A 4E 5D

Answers1 Were you daydreaming2 was thinking3 Are you being4 wasn't implying5 was just wondering6 've been daydreaming7 was always getting caught8 've been reading9 'll probably be daydreaming

AnswersWell, they say that daydreaming makes you more creative. I remember one time I had been trying to work out the details of a presentation.I'd got stuck trying to connect two distinct parts in the final section and needed a way of bringing them together. I'd been racking my brains for about a week and nothing had worked. Then I was travelling home by train and had started reading the paper but actually was just staring out of the window, daydreaming and sort of allowing my mind to freewheel. Suddenly there it was, the answer I had been looking for. It just popped into my head from nowhere. The perfect solution.

Answers1 probably 2 definitely 3 probably4 undoubtedly 5 certainly 6 definitely7 most probably 8 surely

Answers16 2a 3b 4c 5a

Answers1 long, renting 2 staying 3 using 4 living5 long, renting

Answers1 for the summer2 last week3 before last year4 but there's a strike5 she's moving this week6 when they heard the news7 before the end of the year8 ever since I can remember

Answers1 'd been working2 're coming / 'll be coming / 're going to come3 've been going4 was working / 'd been working5 hadn't been listening / wasn't listening6 'll be exhibiting /'s going to be exhibiting /'s exhibiting7 was dreaming / 'd been dreaming8 's hoping