... 61-62, 63-65, 79 when + present simple 65-66Ggerund, the 96 -100as subject of a sentence 99 prepositions + gerund 98 verbs + gerund 97 going to 58- 59, 60, 63-65Hhave to 93 -95 he 1her 1-2hers ... . •43a 1 for 2 for 3 since 4 for 5 for 6 since 7 since 8 since 9 for 10 for 43b 1 I studied for 2 She's worked , since. 3 I worked for 4 I've lived since 5 He's been for 6 I haven't ... 9 You should lie down until youfeel better. 10 I'm going to be in the office until 6 o'clock. 96 a 1 until 2 before 3 until 4 until 5 before 6 before 7 until 8 until 9 before 10 before166indefinite...