I. focus <focuses or foci [ˈfəʊsaı] > [ˈfəʊkəs] 名词
II. focus <focuses or foci [ˈfəʊsaı] > [ˈfəʊkəs] 动词 trans, 不及物动词
| I | focus | 
|---|---|
| you | focus | 
| he/she/it | focuses / focusses | 
| we | focus | 
| you | focus | 
| they | focus | 
| I | focused / focussed | 
|---|---|
| you | focused / focussed | 
| he/she/it | focused / focussed | 
| we | focused / focussed | 
| you | focused / focussed | 
| they | focused / focussed | 
| I | have | focused / focussed | 
|---|---|---|
| you | have | focused / focussed | 
| he/she/it | has | focused / focussed | 
| we | have | focused / focussed | 
| you | have | focused / focussed | 
| they | have | focused / focussed | 
| I | had | focused / focussed | 
|---|---|---|
| you | had | focused / focussed | 
| he/she/it | had | focused / focussed | 
| we | had | focused / focussed | 
| you | had | focused / focussed | 
| they | had | focused / focussed | 
