my job is to make the street clean 和my job is making the street clean 为什么第一个对

动词to表目的

两句都对，用不定式多，动名词少，但并非不可以，语料库中有两百多个例子：
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TOT
1 JOB IS GOING 34
2 JOB IS GETTING 18
3 JOB IS TEACHING 7
4 JOB IS TAKING 6
5 JOB IS SELLING 5
6 JOB IS HELPING 5
7 JOB IS KEEPING 5
8 JOB IS FINDING 4
9 JOB IS DECIDING 4
10 JOB IS RUNNING 4
11 JOB IS KILLING 4
12 JOB IS TRYING 4
13 JOB IS WAITING 4
14 JOB IS READING 3
15 JOB IS MAKING 3
16 JOB IS DEALING 3
17 JOB IS DEMANDING 3
18 JOB IS TURNING 3
19 JOB IS BECOMING 2
20 JOB IS CHOOSING 2
21 JOB IS COMING 2
22 JOB IS FIGURING 2
23 JOB IS FIGHTING 2
24 JOB IS HANGING 2
25 JOB IS INVESTIGATING 2
26 JOB IS LOOKING 2
27 JOB IS PICKING 2
28 JOB IS PREPARING 2
29 JOB IS QUESTIONING 2
30 JOB IS HARDENING 2
31 JOB IS SEEING 2
32 JOB IS STAGGERING 2
33 JOB IS STUDYING 2
34 JOB IS WATCHING 2
35 JOB IS SITTING 1
36 JOB IS SINGING 1
37 JOB IS SHOWING 1
38 JOB IS SERVING 1
39 JOB IS SEEKING 1
40 JOB IS SAYING 1
41 JOB IS SAVING 1
42 JOB IS RAISING 1
43 JOB IS HAPPENING 1
44 JOB IS ROAMING 1
45 JOB IS REWARDING 1
46 JOB IS REVIEWING 1
47 JOB IS RESEARCHING 1
48 JOB IS RESCUING 1
49 JOB IS REPRESENTING 1
50 JOB IS RENTING 1
51 JOB IS REMOVING 1
52 JOB IS REGULATING 1
53 JOB IS REBUILDING 1
54 JOB IS REAPING 1
55 JOB IS PROTECTING 1
56 JOB IS PRODUCING 1
57 JOB IS PRINTING 1
58 JOB IS PREPPING 1
59 JOB IS POLING 1
60 JOB IS PLEASING 1
61 JOB IS PLANTING 1
62 JOB IS PAYING 1
63 JOB IS PAINTING 1
64 JOB IS OVERSEEING 1
65 JOB IS NEGOTIATING 1
66 JOB IS MOWING 1
67 JOB IS MOVING 1
68 JOB IS MINISTERING 1
69 JOB IS MATCHING 1
70 JOB IS MANAGING 1
71 JOB IS LIVING 1
72 JOB IS LEARNING 1
73 JOB IS KNOWING 1
74 JOB IS INSTALLING 1
75 JOB IS HURTING 1
76 JOB IS HANDLING 1
77 JOB IS GRUELING 1
78 JOB IS GOVERNING 1
79 JOB IS GOOFING 1
80 JOB IS GON 1
81 JOB IS GIVING 1
82 JOB IS FIXING 1
83 JOB IS FIRING 1
84 JOB IS FERRETING 1
85 JOB IS EXPLAINING 1
86 JOB IS ENSURING 1
87 JOB IS EAVESDROPPING 1
88 JOB IS EATING 1
89 JOB IS DRIVING 1
90 JOB IS DISPATCHING 1
91 JOB IS DESTROYING 1
92 JOB IS DELIVERING 1
93 JOB IS DEFENDING 1
94 JOB IS CLIMBING 1
95 JOB IS CREATING 1
96 JOB IS COOKING 1
97 JOB IS CONSTRUCTING 1
98 JOB IS CHALLENGING 1
99 JOB IS CAUSING 1
100 JOB IS CASTING 1
TOTAL 217
SEE MORE THAN 100 WORDS/PHRASES

它是说我的职业是.不能用ING ING是现在进行时