‘Do’ can be put before the imperative verb or auxiliary to make it less abrupt and more persuasive.
In the English Grammar Profile, B1 point 64 in the category of CLAUSES/imperatives is defined as:
‘DO’: base form of a main verb, for emphasis or in formal contexts
A search in iWeb for:
. Do _VVI
1 . DO NOTE 2681
2 . DO KEEP 1323 (‘keep in mind’ is the most common here which is B2)
3 . DO REMEMBER 1111
4 . DO CHECK 1032
Shout Out UK5 . DO LET 972
6 . DO TAKE 826
7 . DO MAKE 796
8 . DO TRY 763
9 . DO RESEARCH 371
10 . DO USE 360
11 . DO READ 306
12 . DO GET 300
13 . DO TELL 277
14 . DO SHARE 273
15 . DO GIVE 266
16 . DO KNOW 262
17 . DO COME 234
18 . DO LIKE 233
19 . DO BEAR 233
20 . DO CONSIDER 230
21 . DO LOOK 183
22 . DO PLEASE 170
23 . DO GO 169
24 . DO VISIT 165
25 . DO FEEL 155
26 . DO WATCH 151
27 . DO THINK 150
28 . DO ASK 129
29 . DO EXPECT 113
30 . DO FOLLOW 109
31 . DO CONTACT 90
32 . DO SEE 90
33 . DO HOPE 88
34 . DO BRING 87
35 . DO WORK 87
36 . DO ENSURE 86
37 . DO AVOID 79
38 . DO ENJOY 79
39 . DO JOIN 79
40 . DO WISH 78
41 . DO PAY 77
42 . DO INCLUDE 76
43 . DO MIND 75
44 . DO PLAN 73
45 . DO YALL 71
46 . DO ALLOW 65
47 . DO UNDERSTAND 65
48 . DO LEAVE 64
49 . DO BUY 64
50 . DO Y’ALL 62
51 . DO STUFF 60
52 . DO CALL 59
53 . DO STAY 59
54 . DO FIND 56
55 . DO STEP 56
56 . DO STOP 55
57 . DO WEAR 54
58 . DO DROP 53
59 . DO REALIZE 53
60 . DO WRITE 53
61 . DO SEND 52
62 . DO CONTINUE 51
63 . DO TEST 50
64 . DO WANT 50
65 . DO LOVE 49
66 . DO TALK 49
67 . DO RECOMMEND 45
68 . DO SEEK 44
69 . DO NOTICE 43
70 . DO ADD 43
71 . DO BEWARE 41
72 . DO MENTION 38
73 . DO AGREE 36
74 . DO PUT 36
75 . DO LONG 33
76 . DO SAY 32
77 . DO SIT 32
78 . DO ORDER 31
79 . DO POP 31
80 . DO SET 31
81 . DO NEED 30
82 . DO PROVIDE 30
83 . DO SPEND 30
84 . DO COMMENT 29
85 . DO DRINK 29
86 . DO INVEST 29
87 . DO SHOW 29
88 . DO HELP 28
89 . DO EXPLORE 28
90 . DO BELIEVE 28
91 . DO CONSULT 28
92 . DO LISTEN 27
93 . DO REPORT 27
94 . DO CARRY 26
95 . DO EAT 25
96 . DO SUBSCRIBE 25
97 . DO CHOOSE 24
98 . DO LIGHT 24
99 . DO PICK 24
100 . DO START 24
A2 Vocabulary:
add, agree, bear, believe, bring, call, check, contact, follow, hope, include, join, keep, let, mind, notice, order, pick, plan, pop, set, share, spend, try, wish