`2.` has been examining

DHNB : all day `-> HTHTTD`

`3.` has just finished

DHNB : just `->` HTHT

`4.` has taught

DHNB : for twenty years `->` HTHT

`5.` has been crying

DHNB : for two hours `->` HTHTTD

`6.` has been cleaning

DHNB : all morning `->` HTHTTD

`7.` has just done

DHNB : just `->` HTHT

`8.` has just broken

DHNB : just `->` HTHT

`-----------`

HTHT :

+ ) S + has / have + VpII

- ) S + has / have + not + VpII

? ) Has / have + S + VpII ?

HTHTTD :

+ ) S + has / have + been + V_ing

- ) S + has / have + not + been + V_ing

? ) Has / have + S + been + V_ing ?

`color{#1A1A74}{#}color{#3B3DA1}{M}color{#625DB9}{i}color{#838BED}{t}color{#FOD6FA}{s}color{#F9E8E2}{u}color{#FFDCE3}{k}color{#F5FCFF}{i}`