B4

Charlie ran downstairs and burst into the living room. 'Aliens!' he shouted. 'Aliens are flying over our back garden, right now!'

(present continuous, т.к. действие происходит сейчас)

FLY

B5

His mother laughed. She had never heard anything so silly.

'Really, Charlie, 'she said. 'You know there are no aliens. Now, have you finished your homework? Iwanttoseeit.'

(past perfect, предпрошедшее, т.к. она никогда не слышала ничего подобного до момента, когда Чарли забежал в комнату )

NEVER HEAR

B6 

'It's true!' Charlie cried. 'There are aliens outside, looking for a' place to land their spaceship!' Charlie's father looked up from his newspaper.

(Participle I, “ищущие”, подходит по смысловому контексту)

LOOK

B7

'Now, Charlie. What's all this? I have told you so many times before ' not to tell lies. There are no aliens and they certainly don't fly down Acacia Avenue.'

(present perfect, т.к. я уже сказал, и это имеет силу до сих пор)

TELL

B8

'Okay,' said Charlie. 'Come and look. If there's nothing there, 'I promise I'll just do my homework.'

(past simple, т.к. здесь нам не надо связывать действие с настоящим; завершённое действие в прошлом)

SAY

B9

Charlie's father sighed and put his newspaper down. 'Okay, Charlie. I'll come outside with you and see if there are any aliens in our garden.'

(наш)

WE

B10

'They went into the garden, but there was nothing there. 'But ... but... they were ...' Charlie began to say. His father took his arm and ' led him back inside.

(past simple, т.к. единичное завершённое действие в прошлом)

BEGIN

B11

They walked back into the living room and suddenly stopped. There were two large green creatures sitting on the sofa next to Charlie's mum, who looked very nervous. 'Hello, dear. I think we've got visitors,' she said, weakly.

(Participle I “сидящие”, подходит по смысловому контексту)

SIT